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Obsoletes:
Obsoleted by:
Keywords: management, information, base
Network Working Group D. Fowler, Editor
Request for Comments: 2495 Newbridge Networks
Obsoletes: 1406 January 1999
Category: Standards Track
Definitions of Managed Objects
for the DS1, E1, DS2 and E2 Interface Types
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (1999). All Rights Reserved.
Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes objects used for managing DS1, E1, DS2
and E2 interfaces. This document is a companion document with
Definitions of Managed Objects for the DS0 (RFC 2494 [30]), DS3/E3
(RFC 2496 [28]), and the work in progress, SONET/SDH Interface Types.
This memo specifies a MIB module in a manner that is both compliant
to the SNMPv2 SMI, and semantically identical to the peer SNMPv1
definitions.
Table of Contents
1 The SNMP Management Framework ................................ 2
1.1 Changes from RFC1406 ....................................... 3
2 Overview ..................................................... 4
2.1 Use of ifTable for DS1 Layer ............................... 5
2.2 Usage Guidelines ........................................... 6
2.2.1 Usage of ifStackTable for Routers and DSUs ............... 6
2.2.2 Usage of ifStackTable for DS1/E1 on DS2/E2 ............... 8
2.2.3 Usage of Channelization for DS3, DS1, DS0 ................ 9
2.2.4 Usage of Channelization for DS3, DS2, DS1 ................ 9
2.2.5 Usage of Loopbacks ....................................... 10
2.3 Objectives of this MIB Module .............................. 11
2.4 DS1 Terminology ............................................ 11
Fowler, Ed. Standards Track [Page 1]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
2.4.1 Error Events ............................................. 12
2.4.2 Performance Defects ...................................... 12
2.4.3 Performance Parameters ................................... 14
2.4.4 Failure States ........................................... 17
2.4.5 Other Terms .............................................. 21
3 Object Definitions ........................................... 21
3.1 The DS1 Near End Group ..................................... 22
3.1.1 The DS1 Configuration Table .............................. 22
3.1.2 The DS1 Current Table .................................... 33
3.1.3 The DS1 Interval Table ................................... 36
3.1.4 The DS1 Total Table ...................................... 39
3.1.5 The DS1 Channel Table .................................... 42
3.2 The DS1 Far End Group ...................................... 43
3.2.1 The DS1 Far End Current Table ............................ 43
3.2.2 The DS1 Far End Interval Table ........................... 47
3.2.3 The DS1 Far End Total Table .............................. 50
3.3 The DS1 Fractional Table ................................... 53
3.4 The DS1 Trap Group ......................................... 55
3.5 Conformance Groups ......................................... 61
4 Appendix A - Use of dsx1IfIndex and dsx1LineIndex ............ 66
5 Appendix B - The delay approach to Unavialable Seconds. ..... 69
6 Intellectual Property ........................................ 70
7 Acknowledgments .............................................. 70
8 References ................................................... 71
9 Security Considerations ...................................... 73
10 Author's Address ............................................ 74
11 Full Copyright Statement .................................... 75
1. The SNMP Management Framework
The SNMP Management Framework presently consists of five major
components:
o An overall architecture, described in RFC 2271 [1].
o Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of
Management Information (SMI) is called SMIv1 and described in
STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The
second version, called SMIv2, is described in RFC 1902 [5], RFC
1903 [6] and RFC 1904 [7].
o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC 1157 [8]. A second version of the SNMP
message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901 [9] and
RFC 1906 [10]. The third version of the message protocol is
Fowler, Ed. Standards Track [Page 2]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
called SNMPv3 and described in RFC 1906 [10], RFC 2272 [11] and
RFC 2274 [12].
o Protocol operations for accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [8]. A second set of protocol
operations and associated PDU formats is described in RFC 1905
[13].
o A set of fundamental applications described in RFC 2273 [14] and
the view-based access control mechanism described in RFC 2275
[15]. Managed objects are accessed via a virtual information
store, termed the Management Information Base or MIB. Objects
in the MIB are defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2.
A MIB conforming to the SMIv1 can be produced through the
appropriate translations. The resulting translated MIB must be
semantically equivalent, except where objects or events are
omitted because no translation is possible (use of Counter64).
Some machine readable information in SMIv2 will be converted
into textual descriptions in SMIv1 during the translation
process. However, this loss of machine readable information is
not considered to change the semantics of the MIB.
1.1. Changes from RFC1406
The changes from RFC1406 are the following:
(1) The Fractional Table has been deprecated.
(2) This document uses SMIv2.
(3) Usage is given for ifTable and ifXTable.
(4) Example usage of ifStackTable is included.
(5) dsx1IfIndex has been deprecated.
(6) Support for DS2 and E2 have been added.
(7) Additional lineTypes for DS2, E2, and unframed E1
were added.
(8) The definition of valid intervals has been clarified
for the case where the agent proxied for other devices. In
particular, the treatment of missing intervals has been
clarified.
Fowler, Ed. Standards Track [Page 3]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
(9) An inward loopback has been added.
(10) Additional lineStatus bits have been added for Near End in
Unavailable Signal State, Carrier Equipment Out of Service,
DS2 Payload AIS, and DS2 Performance Threshold.
(11) A read-write line Length object has been added.
(12) Signal mode of other has been added.
(13) Added a lineStatus last change, trap and enabler.
(14) The e1(19) ifType has been obsoleted so this MIB
does not list it as a supported ifType.
(15) Textual Conventions for statistics objects have been used.
(16) A new object, dsx1LoopbackStatus has been introduced to
reflect the loopbacks established on a DS1 interface and
the source to the requests. dsx1LoopbackConfig continues
to be the desired loopback state while dsx1LoopbackStatus
reflects the actual state.
(17) A dual loopback has been added to allow the setting of an
inward loopback and a line loopback at the same time.
(18) An object indicating which channel to use within a parent
object (i.e. DS3) has been added.
(19) An object has been added to indicate whether or not this
DS1/E1 is channelized.
(20) Line coding type of B6ZS has been added for DS2
2. Overview
These objects are used when the particular media being used to
realize an interface is a DS1/E1/DS2/E2 interface. At present, this
applies to these values of the ifType variable in the Internet-
standard MIB:
ds1 (18)
The definitions contained herein are based on the AT&T T-1 Superframe
(a.k.a., D4) and Extended Superframe (ESF) formats [17, 18], the
latter of which conforms to ANSI specifications [19], and the CCITT
Recommendations [20, 21], referred to as E1 for the rest of this
memo.
Fowler, Ed. Standards Track [Page 4]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
The various DS1 and E1 line disciplines are similar enough that
separate MIBs are unwarranted, although there are some differences.
For example, Loss of Frame is defined more rigorously in the ESF
specification than in the D4 specification, but it is defined in
both. Therefore, interface types e1(19) and g703at2mb(67) have been
obsoleted.
Where it is necessary to distinguish between the flavors of E1 with
and without CRC, E1-CRC denotes the "with CRC" form (G.704 Table 4b)
and E1-noCRC denotes the "without CRC" form (G.704 Table 4a).
2.1. Use of ifTable for DS1 Layer
Only the ifGeneralGroup needs to be supported.
ifTable Object Use for DS1 Layer
======================================================================
ifIndex Interface index.
ifDescr See interfaces MIB [16]
ifType ds1(18)
ifSpeed Speed of line rate
DS1 - 1544000
E1 - 2048000
DS2 - 6312000
E2 - 8448000
ifPhysAddress The value of the Circuit Identifier.
If no Circuit Identifier has been assigned
this object should have an octet string
with zero length.
ifAdminStatus See interfaces MIB [16]
ifOperStatus See interfaces MIB [16]
ifLastChange See interfaces MIB [16]
ifName See interfaces MIB [16].
ifLinkUpDownTrapEnable Set to enabled(1).
ifHighSpeed Speed of line in Mega-bits per second
(2, 6, or 8)
ifConnectorPresent Set to true(1) normally, except for
Fowler, Ed. Standards Track [Page 5]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
cases such as DS1/E1 over AAL1/ATM where
false(2) is appropriate
2.2. Usage Guidelines
2.2.1. Usage of ifStackTable for Routers and DSUs
The object dsx1IfIndex has been deprecated. This object previously
allowed a very special proxy situation to exist for Routers and CSUs.
This section now describes how to use ifStackTable to represent this
relationship.
The paragraphs discussing dsx1IfIndex and dsx1LineIndex have been
preserved in Appendix A for informational purposes.
The ifStackTable is used in the proxy case to represent the
association between pairs of interfaces, e.g. this T1 is attached to
that T1. This use is consistent with the use of the ifStackTable to
show the association between various sub-layers of an interface. In
both cases entire PDUs are exchanged between the interface pairs - in
the case of a T1, entire T1 frames are exchanged; in the case of PPP
and HDLC, entire HDLC frames are exchanged. This usage is not meant
to suggest the use of the ifStackTable to represent Time Division
Multiplexing (TDM) connections in general.
External&Internal interface scenario: the SNMP Agent resides on a
host external from the device supporting DS1 interfaces (e.g., a
router). The Agent represents both the host and the DS1 device.
Example:
A shelf full of CSUs connected to a Router. An SNMP Agent residing on
the router proxies for itself and the CSU. The router has also an
Ethernet interface:
Fowler, Ed. Standards Track [Page 6]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
+-----+
| | |
| | | +---------------------+
|E | | 1.544 MBPS | Line#A | DS1 Link
|t | R |---------------+ - - - - - - - - - +------>
|h | | | |
|e | O | 1.544 MBPS | Line#B | DS1 Link
|r | |---------------+ - - - - - - - - - - +------>
|n | U | | CSU Shelf |
|e | | 1.544 MBPS | Line#C | DS1 Link
|t | T |---------------+ - - - -- -- - - - - +------>
| | | | |
|-----| E | 1.544 MBPS | Line#D | DS1 Link
| | |---------------+ - - - - -- - - - - +------>
| | R | |_____________________|
| | |
| +-----+
The assignment of the index values could for example be:
ifIndex Description
1 Ethernet
2 Line#A Router
3 Line#B Router
4 Line#C Router
5 Line#D Router
6 Line#A CSU Router
7 Line#B CSU Router
8 Line#C CSU Router
9 Line#D CSU Router
10 Line#A CSU Network
11 Line#B CSU Network
12 Line#C CSU Network
13 Line#D CSU Network
The ifStackTable is then used to show the relationships between the
various DS1 interfaces.
ifStackTable Entries
HigherLayer LowerLayer
2 6
3 7
4 8
5 9
6 10
7 11
8 12
9 13
Fowler, Ed. Standards Track [Page 7]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
If the CSU shelf is managed by itself by a local SNMP Agent, the
situation would be identical, except the Ethernet and the 4 router
interfaces are deleted. Interfaces would also be numbered from 1 to
8.
ifIndex Description
1 Line#A CSU Router
2 Line#B CSU Router
3 Line#C CSU Router
4 Line#D CSU Router
5 Line#A CSU Network
6 Line#B CSU Network
7 Line#C CSU Network
8 Line#D CSU Network
ifStackTable Entries
HigherLayer LowerLayer
1 5
2 6
3 7
4 8
2.2.2. Usage of ifStackTable for DS1/E1 on DS2/E2
An example is given of how DS1/E2 interfaces are stacked on DS2/E2
interfaces. It is not necessary nor is it always desirable to
represent DS2 interfaces. If this is required, the following
stacking should be used. All ifTypes are ds1. The DS2 is determined
by examining ifSpeed or dsx1LineType.
ifIndex Description
1 DS1 #1
2 DS1 #2
3 DS1 #3
4 DS1 #4
5 DS2
ifStackTable Entries
HigherLayer LowerLayer
1 5
2 5
3 5
4 5
Fowler, Ed. Standards Track [Page 8]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
2.2.3. Usage of Channelization for DS3, DS1, DS0
An example is given here to explain the channelization objects in the
DS3, DS1, and DS0 MIBs to help the implementor use the objects
correctly. Treatment of E3 and E1 would be similar, with the number
of DS0s being different depending on the framing of the E1.
Assume that a DS3 (with ifIndex 1) is Channelized into DS1s (without
DS2s). The object dsx3Channelization is set to enabledDs1. There
will be 28 DS1s in the ifTable. Assume the entries in the ifTable
for the DS1s are created in channel order and the ifIndex values are
2 through 29. In the DS1 MIB, there will be an entry in the
dsx1ChanMappingTable for each ds1. The entries will be as follows:
dsx1ChanMappingTable Entries
ifIndex dsx1Ds1ChannelNumber dsx1ChanMappedIfIndex
1 1 2
1 2 3
......
1 28 29
In addition, the DS1s are channelized into DS0s. The object
dsx1Channelization is set to enabledDS0 for each DS1. When this
object is set to this value, 24 DS0s are created by the agent. There
will be 24 DS0s in the ifTable for each DS1. If the
dsx1Channelization is set to disabled, the 24 DS0s are destroyed.
Assume the entries in the ifTable are created in channel order and
the ifIndex values for the DS0s in the first DS1 are 30 through 53.
In the DS0 MIB, there will be an entry in the dsx0ChanMappingTable
for each DS0. The entries will be as follows:
dsx0ChanMappingTable Entries
ifIndex dsx0Ds0ChannelNumber dsx0ChanMappedIfIndex
2 1 30
2 2 31
......
2 24 53
2.2.4. Usage of Channelization for DS3, DS2, DS1
An example is given here to explain the channelization objects in the
DS3 and DS1 MIBs to help the implementor use the objects correctly.
Fowler, Ed. Standards Track [Page 9]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Assume that a DS3 (with ifIndex 1) is Channelized into DS2s. The
object dsx3Channelization is set to enabledDs2. There will be 7 DS2s
(ifType of DS1) in the ifTable. Assume the entries in the ifTable
for the DS2s are created in channel order and the ifIndex values are
2 through 8. In the DS1 MIB, there will be an entry in the
dsx1ChanMappingTable for each DS2. The entries will be as follows:
dsx1ChanMappingTable Entries
ifIndex dsx1Ds1ChannelNumber dsx1ChanMappedIfIndex
1 1 2
1 2 3
......
1 7 8
In addition, the DS2s are channelized into DS1s. The object
dsx1Channelization is set to enabledDS1 for each DS2. There will be
4 DS1s in the ifTable for each DS2. Assume the entries in the
ifTable are created in channel order and the ifIndex values for the
DS1s in the first DS2 are 9 through 12, then 13 through 16 for the
second DS2, and so on. In the DS1 MIB, there will be an entry in the
dsx1ChanMappingTable for each DS1. The entries will be as follows:
dsx1ChanMappingTable Entries
ifIndex dsx1Ds1ChannelNumber dsx1ChanMappedIfIndex
2 1 9
2 2 10
2 3 11
2 4 12
3 1 13
3 2 14
...
8 4 36
2.2.5. Usage of Loopbacks
This section discusses the behaviour of objects related to loopbacks.
The object dsx1LoopbackConfig represents the desired state of
loopbacks on this interface. Using this object a Manager can
request:
LineLoopback
PayloadLoopback (if ESF framing)
InwardLoopback
DualLoopback (Line + Inward)
NoLoopback
Fowler, Ed. Standards Track [Page 10]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
The remote end can also request loopbacks either through the FDL
channel if ESF or inband if D4. The loopbacks that can be request
this way are:
LineLoopback
PayloadLoopback (if ESF framing)
NoLoopback
To model the current state of loopbacks on a DS1 interface, the
object dsx1LoopbackStatus defines which loopback is currently applies
to an interface. This objects, which is a bitmap, will have bits
turned on which reflect the currently active loopbacks on the
interface as well as the source of those loopbacks.
The following restrictions/rules apply to loopbacks:
The far end cannot undo loopbacks set by a manager.
A manager can undo loopbacks set by the far end.
Both a line loopback and an inward loopback can be set at the same
time. Only these two loopbacks can co-exist and either one may be
set by the manager or the far end. A LineLoopback request from the
far end is incremental to an existing Inward loopback established by
a manager. When a NoLoopback is received from the far end in this
case, the InwardLoopback remains in place.
2.3. Objectives of this MIB Module
There are numerous things that could be included in a MIB for DS1
signals: the management of multiplexors, CSUs, DSUs, and the like.
The intent of this document is to facilitate the common management of
all devices with DS1, E1, DS2, or E3 interfaces. As such, a design
decision was made up front to very closely align the MIB with the set
of objects that can generally be read from these types devices that
are currently deployed.
J2 interfaces are not supported by this MIB.
2.4. DS1 Terminology
The terminology used in this document to describe error conditions on
a DS1 interface as monitored by a DS1 device are based on the late
but not final draft of what became the ANSI T1.231 standard [11]. If
the definition in this document does not match the definition in the
ANSI T1.231 document, the implementer should follow the definition
described in this document.
Fowler, Ed. Standards Track [Page 11]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
2.4.1. Error Events
Bipolar Violation (BPV) Error Event
A BPV error event for an AMI-coded signal is the occurrence of a
pulse of the same polarity as the previous pulse. (See T1.231
Section 6.1.1.1.1) A BPV error event for a B8ZS- or HDB3- coded
signal is the occurrence of a pulse of the same polarity as the
previous pulse without being a part of the zero substitution
code.
Excessive Zeroes (EXZ) Error Event
An Excessive Zeroes error event for an AMI-coded signal is the
occurrence of more than fifteen contiguous zeroes. (See T1.231
Section 6.1.1.1.2) For a B8ZS coded signal, the defect occurs
when more than seven contiguous zeroes are detected.
Line Coding Violation (LCV) Error Event
A Line Coding Violation (LCV) is the occurrence of either a
Bipolar Violation (BPV) or Excessive Zeroes (EXZ) Error Event.
(Also known as CV-L; See T1.231 Section 6.5.1.1)
Path Coding Violation (PCV) Error Event
A Path Coding Violation error event is a frame synchronization
bit error in the D4 and E1-noCRC formats, or a CRC or frame
synch. bit error in the ESF and E1-CRC formats. (Also known as
CV-P; See T1.231 Section 6.5.2.1)
Controlled Slip (CS) Error Event
A Controlled Slip is the replication or deletion of the payload
bits of a DS1 frame. (See T1.231 Section 6.1.1.2.3) A Controlled
Slip may be performed when there is a difference between the
timing of a synchronous receiving terminal and the received
signal. A Controlled Slip does not cause an Out of Frame defect.
2.4.2. Performance Defects
Out Of Frame (OOF) Defect
An OOF defect is the occurrence of a particular density of
Framing Error events. (See T1.231 Section 6.1.2.2.1)
For DS1 links, an Out of Frame defect is declared when the
receiver detects two or more framing errors within a 3 msec
period for ESF signals and 0.75 msec for D4 signals, or two or
more errors out of five or fewer consecutive framing-bits.
For E1 links, an Out Of Frame defect is declared when three
consecutive frame alignment signals have been received with an
error (see G.706 Section 4.1 [26]).
Fowler, Ed. Standards Track [Page 12]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
For DS2 links, an Out of Frame defect is declared when 7 or more
consecutive errored framing patterns (4 multiframe) are received.
The LOF is cleared when 3 or more consecutive correct framing
patterns are received.
Once an Out Of Frame Defect is declared, the framer starts
searching for a correct framing pattern. The Out of Frame defect
ends when the signal is in frame.
In-frame occurs when there are fewer than two frame bit errors
within 3 msec period for ESF signals and 0.75 msec for D4
signals.
For E1 links, in-frame occurs when a) in frame N the frame
alignment signal is correct and b) in frame N+1 the frame
alignment signal is absent (i.e., bit 2 in TS0 is a one) and c)
in frame N+2 the frame alignment signal is present and correct.
(See G.704 Section 4.1)
Alarm Indication Signal (AIS) Defect
For D4 and ESF links, the 'all ones' condition is detected at a
DS1 line interface upon observing an unframed signal with a one's
density of at least 99.9% present for a time equal to or greater
than T, where 3 ms <= T <= 75 ms. The AIS is terminated upon
observing a signal not meeting the one's density or the unframed
signal criteria for a period equal to or greater than than T.
(See G.775, Section 5.4)
For E1 links, the 'all-ones' condition is detected at the line
interface as a string of 512 bits containing fewer than three
zero bits (see O.162 [23] Section 3.3.2).
For DS2 links, the DS2 AIS shall be sent from the NT1 to the user
to indicate a loss of the 6,312 kbps frame capability on the
network side. The DS2 AIS is defined as a bit array of 6,312
kbps in which all binary bits are set to '1'.
The DS2 AIS detection and removal shall be implemented according
to ITU-T Draft Recommendation G.775 [31] Section 5.5:
- a DS2 AIS defect is detected when the incoming signal has two
(2) or less ZEROs in a sequence of 3156 bits (0.5 ms).
- a DS2 AIS defect is cleared when the incoming signal has three
(3) or more ZEROs in a sequence of 3156 bits (0.5 ms).
Fowler, Ed. Standards Track [Page 13]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
2.4.3. Performance Parameters
All performance parameters are accumulated in fifteen minute
intervals and up to 96 intervals (24 hours worth) are kept by an
agent. Fewer than 96 intervals of data whelfill be available if the
agent has been restarted within the last 24 hours. In addition,
there is a rolling 24-hour total of each performance parameter.
Performance parameters continue to be collected when the interface is
down.
There is no requirement for an agent to ensure fixed relationship
between the start of a fifteen minute interval and any wall clock;
however some agents may align the fifteen minute intervals with
quarter hours.
Performance parameters are of types PerfCurrentCount,
PerfIntervalCount and PerfTotalCount. These textual conventions are
all Gauge32, and they are used because it is possible for these
objects to decrease. Objects may decrease when Unavailable Seconds
occurs across a fifteen minutes interval boundary. See Unavailable
Seconds discussion later in this section.
Line Errored Seconds (LES)
A Line Errored Second is a second in which one or more Line Code
Violation error events were detected. (Also known as ES-L; See
T1.231 Section 6.5.1.2)
Controlled Slip Seconds (CSS)
A Controlled Slip Second is a one-second interval containing one
or more controlled slips. (See T1.231 Section 6.5.2.8) This is
not incremented during an Unavailable Second.
Errored Seconds (ES)
For ESF and E1-CRC links an Errored Second is a second with one
or more Path Code Violation OR one or more Out of Frame defects
OR one or more Controlled Slip events OR a detected AIS defect.
(See T1.231 Section 6.5.2.2 and G.826 [32] Section B.1)
For D4 and E1-noCRC links, the presence of Bipolar Violations
also triggers an Errored Second.
This is not incremented during an Unavailable Second.
Fowler, Ed. Standards Track [Page 14]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Bursty Errored Seconds (BES)
A Bursty Errored Second (also known as Errored Second type B in
T1.231 Section 6.5.2.4) is a second with fewer than 320 and more
than 1 Path Coding Violation error events, no Severely Errored
Frame defects and no detected incoming AIS defects. Controlled
slips are not included in this parameter.
This is not incremented during an Unavailable Second. It
applies to ESF signals only.
Severely Errored Seconds (SES)
A Severely Errored Second for ESF signals is a second with 320
or more Path Code Violation Error Events OR one or more Out of
Frame defects OR a detected AIS defect. (See T1.231 Section
6.5.2.5)
For E1-CRC signals, a Severely Errored Second is a second with
832 or more Path Code Violation error events OR one or more Out
of Frame defects.
For E1-noCRC signals, a Severely Errored Second is a 2048 LCVs
or more.
For D4 signals, a Severely Errored Second is a count of one-
second intervals with Framing Error events, or an OOF defect, or
1544 LCVs or more.
Controlled slips are not included in this parameter.
This is not incremented during an Unavailable Second.
Severely Errored Framing Second (SEFS)
An Severely Errored Framing Second is a second with one or more
Out of Frame defects OR a detected AIS defect. (Also known as
SAS-P (SEF/AIS second); See T1.231 Section 6.5.2.6)
Degraded Minutes
A Degraded Minute is one in which the estimated error rate
exceeds 1E-6 but does not exceed 1E-3 (see G.821 [24]).
Degraded Minutes are determined by collecting all of the
Available Seconds, removing any Severely Errored Seconds
grouping the result in 60-second long groups and counting a 60-
second long group (a.k.a., minute) as degraded if the cumulative
errors during the seconds present in the group exceed 1E-6.
Available seconds are merely those seconds which are not
Unavailable as described below.
Fowler, Ed. Standards Track [Page 15]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Unavailable Seconds (UAS)
Unavailable Seconds (UAS) are calculated by counting the number
of seconds that the interface is unavailable. The DS1 interface
is said to be unavailable from the onset of 10 contiguous SESs,
or the onset of the condition leading to a failure (see Failure
States). If the condition leading to the failure was
immediately preceded by one or more contiguous SESs, then the
DS1 interface unavailability starts from the onset of these
SESs. Once unavailable, and if no failure is present, the DS1
interface becomes available at the onset of 10 contiguous
seconds with no SESs. Once unavailable, and if a failure is
present, the DS1 interface becomes available at the onset of 10
contiguous seconds with no SESs, if the failure clearing time is
less than or equal to 10 seconds. If the failure clearing time
is more than 10 seconds, the DS1 interface becomes available at
the onset of 10 contiguous seconds with no SESs, or the onset
period leading to the successful clearing condition, whichever
occurs later. With respect to the DS1 error counts, all
counters are incremented while the DS1 interface is deemed
available. While the interface is deemed unavailable, the only
count that is incremented is UASs.
Note that this definition implies that the agent cannot
determine until after a ten second interval has passed whether a
given one-second interval belongs to available or unavailable
time. If the agent chooses to update the various performance
statistics in real time then it must be prepared to
retroactively reduce the ES, BES, SES, and SEFS counts by 10 and
increase the UAS count by 10 when it determines that available
time has been entered. It must also be prepared to adjust the
PCV count and the DM count as necessary since these parameters
are not accumulated during unavailable time. It must be
similarly prepared to retroactively decrease the UAS count by 10
and increase the ES, BES, and DM counts as necessary upon
entering available time. A special case exists when the 10
second period leading to available or unavailable time crosses a
900 second statistics window boundary, as the foregoing
description implies that the ES, BES, SES, SEFS, DM, and UAS
counts the PREVIOUS interval must be adjusted. In this case
successive GETs of the affected dsx1IntervalSESs and
dsx1IntervalUASs objects will return differing values if the
first GET occurs during the first few seconds of the window.
The agent may instead choose to delay updates to the various
statistics by 10 seconds in order to avoid retroactive
adjustments to the counters. A way to do this is sketched in
Appendix B.
Fowler, Ed. Standards Track [Page 16]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
In any case, a linkDown trap shall be sent only after the agent
has determined for certain that the unavailable state has been
entered, but the time on the trap will be that of the first UAS
(i.e., 10 seconds earlier). A linkUp trap shall be handled
similarly.
According to ANSI T1.231 unavailable time begins at the _onset_
of 10 contiguous severely errored seconds -- that is,
unavailable time starts with the _first_ of the 10 contiguous
SESs. Also, while an interface is deemed unavailable all
counters for that interface are frozen except for the UAS count.
It follows that an implementation which strictly complies with
this standard must _not_ increment any counters other than the
UAS count -- even temporarily -- as a result of anything that
happens during those 10 seconds. Since changes in the signal
state lag the data to which they apply by 10 seconds, an ANSI-
compliant implementation must pass the the one-second statistics
through a 10-second delay line prior to updating any counters.
That can be done by performing the following steps at the end of
each one second interval.
i) Read near/far end CV counter and alarm status flags from the
hardware.
ii) Accumulate the CV counts for the preceding second and compare
them to the ES and SES threshold for the layer in question.
Update the signal state and shift the one-second CV counts and
ES/SES flags into the 10-element delay line. Note that far-end
one-second statistics are to be flagged as "absent" during any
second in which there is an incoming defect at the layer in
question or at any lower layer.
iii) Update the current interval statistics using the signal state
from the _previous_ update cycle and the one-second CV counts
and ES/SES flags shifted out of the 10-element delay line.
This approach is further described in Appendix B.
2.4.4. Failure States
The following failure states are received, or detected failures, that
are reported in the dsx1LineStatus object. When a DS1 interface
would, if ever, produce the conditions leading to the failure state
is described in the appropriate specification.
Fowler, Ed. Standards Track [Page 17]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Far End Alarm Failure
The Far End Alarm failure is also known as "Yellow Alarm" in the
DS1 case, "Distant Alarm" in the E1 case, and "Remote Alarm" in
the DS2 case.
For D4 links, the Far End Alarm failure is declared when bit 6
of all channels has been zero for at least 335 ms and is cleared
when bit 6 of at least one channel is non-zero for a period T,
where T is usually less than one second and always less than 5
seconds. The Far End Alarm failure is not declared for D4 links
when a Loss of Signal is detected.
For ESF links, the Far End Alarm failure is declared if the
Yellow Alarm signal pattern occurs in at least seven out of ten
contiguous 16-bit pattern intervals and is cleared if the Yellow
Alarm signal pattern does not occur in ten contiguous 16-bit
signal pattern intervals.
For E1 links, the Far End Alarm failure is declared when bit 3
of time-slot zero is received set to one on two consecutive
occasions. The Far End Alarm failure is cleared when bit 3 of
time-slot zero is received set to zero.
For DS2 links, if a loss of frame alignment (LOF or LOS) and/or
DS2 AIS condition, is detected, the RAI signal shall be
generated and transmitted to the remote side.
The Remote Alarm Indication(RAI) signal is defined on m-bits as
a repetition of the 16bit sequence consisting of eight binary
'1s' and eight binary '0s' in m-bits(1111111100000000). When
the RAI signal is not sent (in normal operation),the HDLC flag
pattern (01111110) in the m-bit is sent.
The RAI failure is detected when 16 or more consecutive RAI-
patterns (1111111100000000) are received. The RAI failure is
cleared when 4 or more consecutive incorrect-RAI-patterns are
received.
Alarm Indication Signal (AIS) Failure
The Alarm Indication Signal failure is declared when an AIS
defect is detected at the input and the AIS defect still exists
after the Loss Of Frame failure (which is caused by the unframed
nature of the 'all-ones' signal) is declared. The AIS failure is
cleared when the Loss Of Frame failure is cleared. (See T1.231
Section 6.2.1.2.1)
Fowler, Ed. Standards Track [Page 18]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
An AIS defect at a 6312 kbit/s (G.704) interface is detected
when the incoming signal has two {2} or less ZEROs in a sequence
of 3156 bits (0.5ms).
The AIS signal defect is cleared when the incoming signal has
three {3} or more ZEROs in a sequence of 3156 bits (0.5ms).
Loss Of Frame Failure
For DS1 links, the Loss Of Frame failure is declared when an OOF
or LOS defect has persisted for T seconds, where 2 <= T <= 10.
The Loss Of Frame failure is cleared when there have been no OOF
or LOS defects during a period T where 0 <= T <= 20. Many
systems will perform "hit integration" within the period T
before declaring or clearing the failure e.g., see TR 62411
[25].
For E1 links, the Loss Of Frame Failure is declared when an OOF
defect is detected.
Loss Of Signal Failure
For DS1, the Loss Of Signal failure is declared upon observing
175 +/- 75 contiguous pulse positions with no pulses of either
positive or negative polarity. The LOS failure is cleared upon
observing an average pulse density of at least 12.5% over a
period of 175 +/- 75 contiguous pulse positions starting with
the receipt of a pulse.
For E1 links, the Loss Of Signal failure is declared when
greater than 10 consecutive zeroes are detected (see O.162
Section 3.4`<.4).
A LOS defect at 6312kbit/s interfaces is detected when the
incoming signal has "no transitions", i.e. when the signal level
is less than or equal to a signal level of 35dB below nominal,
for N consecutive pulse intervals, where 10 <=N<=255.
The LOS defect is cleared when the incoming signal has
"transitions", i.e. when the signal level is greater than or
equal to a signal level of 9dB below nominal, for N consecutive
pulse intervals, where 10<=N<=255.
A signal with "transitions" corresponds to a G.703 compliant
signal.
Fowler, Ed. Standards Track [Page 19]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Loopback Pseudo-Failure
The Loopback Pseudo-Failure is declared when the near end
equipment has placed a loopback (of any kind) on the DS1. This
allows a management entity to determine from one object whether
the DS1 can be considered to be in service or not (from the
point of view of the near end equipment).
TS16 Alarm Indication Signal Failure
For E1 links, the TS16 Alarm Indication Signal failure is
declared when time-slot 16 is received as all ones for all
frames of two consecutive multiframes (see G.732 Section 4.2.6).
This condition is never declared for DS1.
Loss Of MultiFrame Failure
The Loss Of MultiFrame failure is declared when two consecutive
multiframe alignment signals (bits 4 through 7 of TS16 of frame
0) have been received with an error. The Loss Of Multiframe
failure is cleared when the first correct multiframe alignment
signal is received. The Loss Of Multiframe failure can only be
declared for E1 links operating with G.732 [27] framing
(sometimes called "Channel Associated Signalling" mode).
Far End Loss Of Multiframe Failure
The Far End Loss Of Multiframe failure is declared when bit 2 of
TS16 of frame 0 is received set to one on two consecutive
occasions. The Far End Loss Of Multiframe failure is cleared
when bit 2 of TS16 of frame 0 is received set to zero. The Far
End Loss Of Multiframe failure can only be declared for E1 links
operating in "Channel Associated Signalling" mode. (See G.732)
DS2 Payload AIS Failure
The DS2 Payload AIS is detected when the incoming signal of the
6,312 kbps frame payload [TS1-TS96] has 2 or less 0's in a
sequence of 3072 bits (0.5ms). The DS2 Payload AIS is cleared
when the incoming signal of the 6,312 kbps frame payload [TS1-
TS96] has 3 or more 0's in a sequence of 3072 bits (0.5 ms).
DS2 Performance Threshold
DS2 Performance Threshold Failure monitors equipment performance
and is based on the CRC (Cyclic Redundancy Check) Procedure
defined in G.704.
The DS2 Performance Threshold Failure is detected when the bit
error ratio exceeds 10^-4 (Performance Threshold), and the DS2
Performance Threshold Failure shall be cleared when the bit
error ratio decreased to less than 10^-6."
Fowler, Ed. Standards Track [Page 20]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
2.4.5. Other Terms
Circuit Identifier
This is a character string specified by the circuit vendor, and
is useful when communicating with the vendor during the
troubleshooting process.
Proxy
In this document, the word proxy is meant to indicate an
application which receives SNMP messages and replies to them on
behalf of the devices which implement the actual DS3/E3
interfaces. The proxy may have already collected the
information about the DS3/E3 interfaces into its local database
and may not necessarily forward the requests to the actual
DS3/E3 interface. It is expected in such an application that
there are periods of time where the proxy is not communicating
with the DS3/E3 interfaces. In these instances the proxy will
not necessarily have up-to-date configuration information and
will most likely have missed the collection of some statistics
data. Missed statistics data collection will result in invalid
data in the interval table.
3. Object Definitions
DS1-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
NOTIFICATION-TYPE, transmission FROM SNMPv2-SMI
DisplayString, TimeStamp, TruthValue FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP FROM SNMPv2-CONF
InterfaceIndex, ifIndex FROM IF-MIB
PerfCurrentCount, PerfIntervalCount,
PerfTotalCount FROM PerfHist-TC-MIB;
ds1 MODULE-IDENTITY
LAST-UPDATED "9808011830Z"
ORGANIZATION "IETF Trunk MIB Working Group"
CONTACT-INFO
" David Fowler
Postal: Newbridge Networks Corporation
600 March Road
Kanata, Ontario, Canada K2K 2E6
Tel: +1 613 591 3600
Fowler, Ed. Standards Track [Page 21]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Fax: +1 613 599 3667
E-mail: davef@newbridge.com"
DESCRIPTION
"The MIB module to describe DS1, E1, DS2, and
E2 interfaces objects."
::= { transmission 18 }
-- note that this subsumes cept (19) and g703at2mb (67)
-- there is no separate CEPT or G703AT2MB MIB
-- The DS1 Near End Group
-- The DS1 Near End Group consists of five tables:
-- DS1 Configuration
-- DS1 Current
-- DS1 Interval
-- DS1 Total
-- DS1 Channel Table
-- The DS1 Configuration Table
dsx1ConfigTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1ConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 Configuration table."
::= { ds1 6 }
dsx1ConfigEntry OBJECT-TYPE
SYNTAX Dsx1ConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Configuration table."
INDEX { dsx1LineIndex }
::= { dsx1ConfigTable 1 }
Dsx1ConfigEntry ::=
SEQUENCE {
dsx1LineIndex InterfaceIndex,
dsx1IfIndex InterfaceIndex,
dsx1TimeElapsed INTEGER,
dsx1ValidIntervals INTEGER,
dsx1LineType INTEGER,
dsx1LineCoding INTEGER,
Fowler, Ed. Standards Track [Page 22]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1SendCode INTEGER,
dsx1CircuitIdentifier DisplayString,
dsx1LoopbackConfig INTEGER,
dsx1LineStatus INTEGER,
dsx1SignalMode INTEGER,
dsx1TransmitClockSource INTEGER,
dsx1Fdl INTEGER,
dsx1InvalidIntervals INTEGER,
dsx1LineLength INTEGER,
dsx1LineStatusLastChange TimeStamp,
dsx1LineStatusChangeTrapEnable INTEGER,
dsx1LoopbackStatus INTEGER,
dsx1Ds1ChannelNumber INTEGER,
dsx1Channelization INTEGER
}
dsx1LineIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object should be made equal to ifIndex. The
next paragraph describes its previous usage.
Making the object equal to ifIndex allows proper
use of ifStackTable and ds0/ds0bundle mibs.
Previously, this object is the identifier of a DS1
Interface on a managed device. If there is an
ifEntry that is directly associated with this and
only this DS1 interface, it should have the same
value as ifIndex. Otherwise, number the
dsx1LineIndices with an unique identifier
following the rules of choosing a number that is
greater than ifNumber and numbering the inside
interfaces (e.g., equipment side) with even
numbers and outside interfaces (e.g, network side)
with odd numbers."
::= { dsx1ConfigEntry 1 }
dsx1IfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"This value for this object is equal to the value
of ifIndex from the Interfaces table of MIB II
(RFC 1213)."
::= { dsx1ConfigEntry 2 }
Fowler, Ed. Standards Track [Page 23]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1TimeElapsed OBJECT-TYPE
SYNTAX INTEGER (0..899)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds that have elapsed since
the beginning of the near end current error-
measurement period. If, for some reason, such
as an adjustment in the system's time-of-day
clock, the current interval exceeds the maximum
value, the agent will return the maximum value."
::= { dsx1ConfigEntry 3 }
dsx1ValidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of previous near end intervals for
which data was collected. The value will be
96 unless the interface was brought online within
the last 24 hours, in which case the value will be
the number of complete 15 minute near end
intervals since the interface has been online. In
the case where the agent is a proxy, it is
possible that some intervals are unavailable. In
this case, this interval is the maximum interval
number for which data is available."
::= { dsx1ConfigEntry 4 }
dsx1LineType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
dsx1ESF(2),
dsx1D4(3),
dsx1E1(4),
dsx1E1CRC(5),
dsx1E1MF(6),
dsx1E1CRCMF(7),
dsx1Unframed(8),
dsx1E1Unframed(9),
dsx1DS2M12(10),
dsx2E2(11)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
Fowler, Ed. Standards Track [Page 24]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
"This variable indicates the variety of DS1
Line implementing this circuit. The type of
circuit affects the number of bits per second
that the circuit can reasonably carry, as well
as the interpretation of the usage and error
statistics. The values, in sequence, describe:
TITLE: SPECIFICATION:
dsx1ESF Extended SuperFrame DS1 (T1.107)
dsx1D4 AT&T D4 format DS1 (T1.107)
dsx1E1 ITU-T Recommendation G.704
(Table 4a)
dsx1E1-CRC ITU-T Recommendation G.704
(Table 4b)
dsxE1-MF G.704 (Table 4a) with TS16
multiframing enabled
dsx1E1-CRC-MF G.704 (Table 4b) with TS16
multiframing enabled
dsx1Unframed DS1 with No Framing
dsx1E1Unframed E1 with No Framing (G.703)
dsx1DS2M12 DS2 frame format (T1.107)
dsx1E2 E2 frame format (G.704)
For clarification, the capacity for each E1 type
is as listed below:
dsx1E1Unframed - E1, no framing = 32 x 64k = 2048k
dsx1E1 or dsx1E1CRC - E1, with framing,
no signalling = 31 x 64k = 1984k
dsx1E1MF or dsx1E1CRCMF - E1, with framing,
signalling = 30 x 64k = 1920k
For further information See ITU-T Recomm G.704"
::= { dsx1ConfigEntry 5 }
dsx1LineCoding OBJECT-TYPE
SYNTAX INTEGER {
dsx1JBZS (1),
dsx1B8ZS (2),
dsx1HDB3 (3),
dsx1ZBTSI (4),
dsx1AMI (5),
other(6),
dsx1B6ZS(7)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable describes the variety of Zero Code
Fowler, Ed. Standards Track [Page 25]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Suppression used on this interface, which in turn
affects a number of its characteristics.
dsx1JBZS refers the Jammed Bit Zero Suppression,
in which the AT&T specification of at least one
pulse every 8 bit periods is literally implemented
by forcing a pulse in bit 8 of each channel.
Thus, only seven bits per channel, or 1.344 Mbps,
is available for data.
dsx1B8ZS refers to the use of a specified pattern
of normal bits and bipolar violations which are
used to replace a sequence of eight zero bits.
ANSI Clear Channels may use dsx1ZBTSI, or Zero
Byte Time Slot Interchange.
E1 links, with or without CRC, use dsx1HDB3 or
dsx1AMI.
dsx1AMI refers to a mode wherein no zero code
suppression is present and the line encoding does
not solve the problem directly. In this
application, the higher layer must provide data
which meets or exceeds the pulse density
requirements, such as inverting HDLC data.
dsx1B6ZS refers to the user of a specifed pattern
of normal bits and bipolar violations which are
used to replace a sequence of six zero bits. Used
for DS2."
::= { dsx1ConfigEntry 6 }
dsx1SendCode OBJECT-TYPE
SYNTAX INTEGER {
dsx1SendNoCode(1),
dsx1SendLineCode(2),
dsx1SendPayloadCode(3),
dsx1SendResetCode(4),
dsx1SendQRS(5),
dsx1Send511Pattern(6),
dsx1Send3in24Pattern(7),
dsx1SendOtherTestPattern(8)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
Fowler, Ed. Standards Track [Page 26]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
"This variable indicates what type of code is
being sent across the DS1 interface by the device.
Setting this variable causes the interface to send
the code requested. The values mean:
dsx1SendNoCode
sending looped or normal data
dsx1SendLineCode
sending a request for a line loopback
dsx1SendPayloadCode
sending a request for a payload loopback
dsx1SendResetCode
sending a loopback termination request
dsx1SendQRS
sending a Quasi-Random Signal (QRS) test
pattern
dsx1Send511Pattern
sending a 511 bit fixed test pattern
dsx1Send3in24Pattern
sending a fixed test pattern of 3 bits set
in 24
dsx1SendOtherTestPattern
sending a test pattern other than those
described by this object"
::= { dsx1ConfigEntry 7 }
dsx1CircuitIdentifier OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable contains the transmission vendor's
circuit identifier, for the purpose of
facilitating troubleshooting."
::= { dsx1ConfigEntry 8 }
dsx1LoopbackConfig OBJECT-TYPE
SYNTAX INTEGER {
dsx1NoLoop(1),
dsx1PayloadLoop(2),
dsx1LineLoop(3),
dsx1OtherLoop(4),
Fowler, Ed. Standards Track [Page 27]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1InwardLoop(5),
dsx1DualLoop(6)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable represents the desired loopback
configuration of the DS1 interface. Agents
supporting read/write access should return
inconsistentValue in response to a requested
loopback state that the interface does not
support. The values mean:
dsx1NoLoop
Not in the loopback state. A device that is not
capable of performing a loopback on the interface
shall always return this as its value.
dsx1PayloadLoop
The received signal at this interface is looped
through the device. Typically the received signal
is looped back for retransmission after it has
passed through the device's framing function.
dsx1LineLoop
The received signal at this interface does not go
through the device (minimum penetration) but is
looped back out.
dsx1OtherLoop
Loopbacks that are not defined here.
dsx1InwardLoop
The transmitted signal at this interface is
looped back and received by the same interface.
What is transmitted onto the line is product
dependent.
dsx1DualLoop
Both dsx1LineLoop and dsx1InwardLoop will be
active simultaneously."
::= { dsx1ConfigEntry 9 }
dsx1LineStatus OBJECT-TYPE
SYNTAX INTEGER (1..131071)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
Fowler, Ed. Standards Track [Page 28]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
"This variable indicates the Line Status of the
interface. It contains loopback, failure,
received 'alarm' and transmitted 'alarms
information.
The dsx1LineStatus is a bit map represented as a
sum, therefore, it can represent multiple failures
(alarms) and a LoopbackState simultaneously.
dsx1NoAlarm must be set if and only if no other
flag is set.
If the dsx1loopbackState bit is set, the loopback
in effect can be determined from the
dsx1loopbackConfig object.
The various bit positions are:
1 dsx1NoAlarm No alarm present
2 dsx1RcvFarEndLOF Far end LOF (a.k.a., Yellow Alarm)
4 dsx1XmtFarEndLOF Near end sending LOF Indication
8 dsx1RcvAIS Far end sending AIS
16 dsx1XmtAIS Near end sending AIS
32 dsx1LossOfFrame Near end LOF (a.k.a., Red Alarm)
64 dsx1LossOfSignal Near end Loss Of Signal
128 dsx1LoopbackState Near end is looped
256 dsx1T16AIS E1 TS16 AIS
512 dsx1RcvFarEndLOMF Far End Sending TS16 LOMF
1024 dsx1XmtFarEndLOMF Near End Sending TS16 LOMF
2048 dsx1RcvTestCode Near End detects a test code
4096 dsx1OtherFailure any line status not defined here
8192 dsx1UnavailSigState Near End in Unavailable Signal
State
16384 dsx1NetEquipOOS Carrier Equipment Out of Service
32768 dsx1RcvPayloadAIS DS2 Payload AIS
65536 dsx1Ds2PerfThreshold DS2 Performance Threshold
Exceeded"
::= { dsx1ConfigEntry 10 }
dsx1SignalMode OBJECT-TYPE
SYNTAX INTEGER {
none (1),
robbedBit (2),
bitOriented (3),
messageOriented (4),
other (5)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
Fowler, Ed. Standards Track [Page 29]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
"'none' indicates that no bits are reserved for
signaling on this channel.
'robbedBit' indicates that DS1 Robbed Bit Sig-
naling is in use.
'bitOriented' indicates that E1 Channel Asso-
ciated Signaling is in use.
'messageOriented' indicates that Common Chan-
nel Signaling is in use either on channel 16 of
an E1 link or channel 24 of a DS1."
::= { dsx1ConfigEntry 11 }
dsx1TransmitClockSource OBJECT-TYPE
SYNTAX INTEGER {
loopTiming(1),
localTiming(2),
throughTiming(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The source of Transmit Clock.
'loopTiming' indicates that the recovered re-
ceive clock is used as the transmit clock.
'localTiming' indicates that a local clock
source is used or when an external clock is
attached to the box containing the interface.
'throughTiming' indicates that recovered re-
ceive clock from another interface is used as
the transmit clock."
::= { dsx1ConfigEntry 12 }
dsx1Fdl OBJECT-TYPE
SYNTAX INTEGER (1..15)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This bitmap describes the use of the facili-
ties data link, and is the sum of the capabili-
ties. Set any bits that are appropriate:
other(1),
dsx1AnsiT1403(2),
dsx1Att54016(4),
Fowler, Ed. Standards Track [Page 30]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1FdlNone(8)
'other' indicates that a protocol other than
one following is used.
'dsx1AnsiT1403' refers to the FDL exchange
recommended by ANSI.
'dsx1Att54016' refers to ESF FDL exchanges.
'dsx1FdlNone' indicates that the device does
not use the FDL."
::= { dsx1ConfigEntry 13 }
dsx1InvalidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of intervals in the range from 0 to
dsx1ValidIntervals for which no data is
available. This object will typically be zero
except in cases where the data for some intervals
are not available (e.g., in proxy situations)."
::= { dsx1ConfigEntry 14 }
dsx1LineLength OBJECT-TYPE
SYNTAX INTEGER (0..64000)
UNITS "meters"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The length of the ds1 line in meters. This
objects provides information for line build out
circuitry. This object is only useful if the
interface has configurable line build out
circuitry."
::= { dsx1ConfigEntry 15 }
dsx1LineStatusLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of MIB II's sysUpTime object at the
time this DS1 entered its current line status
state. If the current state was entered prior to
Fowler, Ed. Standards Track [Page 31]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
the last re-initialization of the proxy-agent,
then this object contains a zero value."
::= { dsx1ConfigEntry 16 }
dsx1LineStatusChangeTrapEnable OBJECT-TYPE
SYNTAX INTEGER {
enabled(1),
disabled(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates whether dsx1LineStatusChange traps
should be generated for this interface."
DEFVAL { disabled }
::= { dsx1ConfigEntry 17 }
dsx1LoopbackStatus OBJECT-TYPE
SYNTAX INTEGER (1..127)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable represents the current state of the
loopback on the DS1 interface. It contains
information about loopbacks established by a
manager and remotely from the far end.
The dsx1LoopbackStatus is a bit map represented as
a sum, therefore is can represent multiple
loopbacks simultaneously.
The various bit positions are:
1 dsx1NoLoopback
2 dsx1NearEndPayloadLoopback
4 dsx1NearEndLineLoopback
8 dsx1NearEndOtherLoopback
16 dsx1NearEndInwardLoopback
32 dsx1FarEndPayloadLoopback
64 dsx1FarEndLineLoopback"
::= { dsx1ConfigEntry 18 }
dsx1Ds1ChannelNumber OBJECT-TYPE
SYNTAX INTEGER (0..28)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable represents the channel number of
Fowler, Ed. Standards Track [Page 32]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
the DS1/E1 on its parent Ds2/E2 or DS3/E3. A
value of 0 indicated this DS1/E1 does not have a
parent DS3/E3."
::= { dsx1ConfigEntry 19 }
dsx1Channelization OBJECT-TYPE
SYNTAX INTEGER {
disabled(1),
enabledDs0(2),
enabledDs1(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates whether this ds1/e1 is channelized or
unchannelized. The value of enabledDs0 indicates
that this is a DS1 channelized into DS0s. The
value of enabledDs1 indicated that this is a DS2
channelized into DS1s. Setting this value will
cause the creation or deletion of entries in the
ifTable for the DS0s that are within the DS1."
::= { dsx1ConfigEntry 20 }
-- The DS1 Current Table
dsx1CurrentTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1CurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 current table contains various statistics
being collected for the current 15 minute
interval."
::= { ds1 7 }
dsx1CurrentEntry OBJECT-TYPE
SYNTAX Dsx1CurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Current table."
INDEX { dsx1CurrentIndex }
::= { dsx1CurrentTable 1 }
Dsx1CurrentEntry ::=
SEQUENCE {
dsx1CurrentIndex InterfaceIndex,
dsx1CurrentESs PerfCurrentCount,
Fowler, Ed. Standards Track [Page 33]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1CurrentSESs PerfCurrentCount,
dsx1CurrentSEFSs PerfCurrentCount,
dsx1CurrentUASs PerfCurrentCount,
dsx1CurrentCSSs PerfCurrentCount,
dsx1CurrentPCVs PerfCurrentCount,
dsx1CurrentLESs PerfCurrentCount,
dsx1CurrentBESs PerfCurrentCount,
dsx1CurrentDMs PerfCurrentCount,
dsx1CurrentLCVs PerfCurrentCount
}
dsx1CurrentIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the
DS1 interface to which this entry is applicable.
The interface identified by a particular value of
this index is the same interface as identified by
the same value as a dsx1LineIndex object
instance."
::= { dsx1CurrentEntry 1 }
dsx1CurrentESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Errored Seconds."
::= { dsx1CurrentEntry 2 }
dsx1CurrentSESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Severely Errored Seconds."
::= { dsx1CurrentEntry 3 }
dsx1CurrentSEFSs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Severely Errored Framing Seconds."
::= { dsx1CurrentEntry 4 }
Fowler, Ed. Standards Track [Page 34]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1CurrentUASs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Unavailable Seconds."
::= { dsx1CurrentEntry 5 }
dsx1CurrentCSSs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Controlled Slip Seconds."
::= { dsx1CurrentEntry 6 }
dsx1CurrentPCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Path Coding Violations."
::= { dsx1CurrentEntry 7 }
dsx1CurrentLESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Errored Seconds."
::= { dsx1CurrentEntry 8 }
dsx1CurrentBESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Bursty Errored Seconds."
::= { dsx1CurrentEntry 9 }
dsx1CurrentDMs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Degraded Minutes."
::= { dsx1CurrentEntry 10 }
Fowler, Ed. Standards Track [Page 35]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1CurrentLCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Code Violations (LCVs)."
::= { dsx1CurrentEntry 11 }
-- The DS1 Interval Table
dsx1IntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1IntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 Interval Table contains various
statistics collected by each DS1 Interface over
the previous 24 hours of operation. The past 24
hours are broken into 96 completed 15 minute
intervals. Each row in this table represents one
such interval (identified by dsx1IntervalNumber)
for one specific instance (identified by
dsx1IntervalIndex)."
::= { ds1 8 }
dsx1IntervalEntry OBJECT-TYPE
SYNTAX Dsx1IntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Interval table."
INDEX { dsx1IntervalIndex, dsx1IntervalNumber }
::= { dsx1IntervalTable 1 }
Dsx1IntervalEntry ::=
SEQUENCE {
dsx1IntervalIndex InterfaceIndex,
dsx1IntervalNumber INTEGER,
dsx1IntervalESs PerfIntervalCount,
dsx1IntervalSESs PerfIntervalCount,
dsx1IntervalSEFSs PerfIntervalCount,
dsx1IntervalUASs PerfIntervalCount,
dsx1IntervalCSSs PerfIntervalCount,
dsx1IntervalPCVs PerfIntervalCount,
dsx1IntervalLESs PerfIntervalCount,
dsx1IntervalBESs PerfIntervalCount,
dsx1IntervalDMs PerfIntervalCount,
dsx1IntervalLCVs PerfIntervalCount,
Fowler, Ed. Standards Track [Page 36]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1IntervalValidData TruthValue
}
dsx1IntervalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS1
interface to which this entry is applicable. The
interface identified by a particular value of this
index is the same interface as identified by the
same value as a dsx1LineIndex object instance."
::= { dsx1IntervalEntry 1 }
dsx1IntervalNumber OBJECT-TYPE
SYNTAX INTEGER (1..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A number between 1 and 96, where 1 is the most
recently completed 15 minute interval and 96 is
the 15 minutes interval completed 23 hours and 45
minutes prior to interval 1."
::= { dsx1IntervalEntry 2 }
dsx1IntervalESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Errored Seconds."
::= { dsx1IntervalEntry 3 }
dsx1IntervalSESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Severely Errored Seconds."
::= { dsx1IntervalEntry 4 }
dsx1IntervalSEFSs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Severely Errored Framing Seconds."
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
::= { dsx1IntervalEntry 5 }
dsx1IntervalUASs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Unavailable Seconds. This object
may decrease if the occurance of unavailable
seconds occurs across an inteval boundary."
::= { dsx1IntervalEntry 6 }
dsx1IntervalCSSs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Controlled Slip Seconds."
::= { dsx1IntervalEntry 7 }
dsx1IntervalPCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Path Coding Violations."
::= { dsx1IntervalEntry 8 }
dsx1IntervalLESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Errored Seconds."
::= { dsx1IntervalEntry 9 }
dsx1IntervalBESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Bursty Errored Seconds."
::= { dsx1IntervalEntry 10 }
dsx1IntervalDMs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
Fowler, Ed. Standards Track [Page 38]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
DESCRIPTION
"The number of Degraded Minutes."
::= { dsx1IntervalEntry 11 }
dsx1IntervalLCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Code Violations."
::= { dsx1IntervalEntry 12 }
dsx1IntervalValidData OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if the data for this
interval is valid."
::= { dsx1IntervalEntry 13 }
-- The DS1 Total Table
dsx1TotalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1TotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 Total Table contains the cumulative sum
of the various statistics for the 24 hour period
preceding the current interval."
::= { ds1 9 }
dsx1TotalEntry OBJECT-TYPE
SYNTAX Dsx1TotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Total table."
INDEX { dsx1TotalIndex }
::= { dsx1TotalTable 1 }
Dsx1TotalEntry ::=
SEQUENCE {
dsx1TotalIndex InterfaceIndex,
dsx1TotalESs PerfTotalCount,
dsx1TotalSESs PerfTotalCount,
dsx1TotalSEFSs PerfTotalCount,
dsx1TotalUASs PerfTotalCount,
Fowler, Ed. Standards Track [Page 39]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1TotalCSSs PerfTotalCount,
dsx1TotalPCVs PerfTotalCount,
dsx1TotalLESs PerfTotalCount,
dsx1TotalBESs PerfTotalCount,
dsx1TotalDMs PerfTotalCount,
dsx1TotalLCVs PerfTotalCount
}
dsx1TotalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS1
interface to which this entry is applicable. The
interface identified by a particular value of this
index is the same interface as identified by the
same value as a dsx1LineIndex object instance."
::= { dsx1TotalEntry 1 }
dsx1TotalESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The sum of Errored Seconds encountered by a DS1
interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx1TotalEntry 2 }
dsx1TotalSESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Severely Errored Seconds
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1TotalEntry 3 }
dsx1TotalSEFSs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Severely Errored Framing Seconds
Fowler, Ed. Standards Track [Page 40]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1TotalEntry 4 }
dsx1TotalUASs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Unavailable Seconds encountered by
a DS1 interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx1TotalEntry 5 }
dsx1TotalCSSs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Controlled Slip Seconds encountered
by a DS1 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as
0."
::= { dsx1TotalEntry 6 }
dsx1TotalPCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Path Coding Violations encountered
by a DS1 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as
0."
::= { dsx1TotalEntry 7 }
dsx1TotalLESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Errored Seconds encountered by
a DS1 interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx1TotalEntry 8 }
dsx1TotalBESs OBJECT-TYPE
Fowler, Ed. Standards Track [Page 41]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Bursty Errored Seconds (BESs)
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1TotalEntry 9 }
dsx1TotalDMs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Degraded Minutes (DMs) encountered
by a DS1 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as
0."
::= { dsx1TotalEntry 10 }
dsx1TotalLCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Code Violations (LCVs)
encountered by a DS1 interface in the current 15
minute interval. Invalid 15 minute intervals
count as 0."
::= { dsx1TotalEntry 11 }
-- The DS1 Channel Table
dsx1ChanMappingTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1ChanMappingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 Channel Mapping table. This table maps a
DS1 channel number on a particular DS3 into an
ifIndex. In the presence of DS2s, this table can
be used to map a DS2 channel number on a DS3 into
an ifIndex, or used to map a DS1 channel number on
a DS2 onto an ifIndex."
::= { ds1 16 }
dsx1ChanMappingEntry OBJECT-TYPE
SYNTAX Dsx1ChanMappingEntry
Fowler, Ed. Standards Track [Page 42]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Channel Mapping table. There
is an entry in this table corresponding to each
ds1 ifEntry within any interface that is
channelized to the individual ds1 ifEntry level.
This table is intended to facilitate mapping from
channelized interface / channel number to DS1
ifEntry. (e.g. mapping (DS3 ifIndex, DS1 Channel
Number) -> ifIndex)
While this table provides information that can
also be found in the ifStackTable and
dsx1ConfigTable, it provides this same information
with a single table lookup, rather than by walking
the ifStackTable to find the various constituent
ds1 ifTable entries, and testing various
dsx1ConfigTable entries to check for the entry
with the applicable DS1 channel number."
INDEX { ifIndex, dsx1Ds1ChannelNumber }
::= { dsx1ChanMappingTable 1 }
Dsx1ChanMappingEntry ::=
SEQUENCE {
dsx1ChanMappedIfIndex InterfaceIndex
}
dsx1ChanMappedIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the ifIndex value assigned
by the agent for the individual ds1 ifEntry that
corresponds to the given DS1 channel number
(specified by the INDEX element
dsx1Ds1ChannelNumber) of the given channelized
interface (specified by INDEX element ifIndex)."
::= { dsx1ChanMappingEntry 1 }
-- The DS1 Far End Current Table
dsx1FarEndCurrentTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1FarEndCurrentEntry
MAX-ACCESS not-accessible
Fowler, Ed. Standards Track [Page 43]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
STATUS current
DESCRIPTION
"The DS1 Far End Current table contains various
statistics being collected for the current 15
minute interval. The statistics are collected
from the far end messages on the Facilities Data
Link. The definitions are the same as described
for the near-end information."
::= { ds1 10 }
dsx1FarEndCurrentEntry OBJECT-TYPE
SYNTAX Dsx1FarEndCurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Far End Current table."
INDEX { dsx1FarEndCurrentIndex }
::= { dsx1FarEndCurrentTable 1 }
Dsx1FarEndCurrentEntry ::=
SEQUENCE {
dsx1FarEndCurrentIndex InterfaceIndex,
dsx1FarEndTimeElapsed INTEGER,
dsx1FarEndValidIntervals INTEGER,
dsx1FarEndCurrentESs PerfCurrentCount,
dsx1FarEndCurrentSESs PerfCurrentCount,
dsx1FarEndCurrentSEFSs PerfCurrentCount,
dsx1FarEndCurrentUASs PerfCurrentCount,
dsx1FarEndCurrentCSSs PerfCurrentCount,
dsx1FarEndCurrentLESs PerfCurrentCount,
dsx1FarEndCurrentPCVs PerfCurrentCount,
dsx1FarEndCurrentBESs PerfCurrentCount,
dsx1FarEndCurrentDMs PerfCurrentCount,
dsx1FarEndInvalidIntervals INTEGER
}
dsx1FarEndCurrentIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS1
interface to which this entry is applicable. The
interface identified by a particular value of this
index is identical to the interface identified by
the same value of dsx1LineIndex."
::= { dsx1FarEndCurrentEntry 1 }
Fowler, Ed. Standards Track [Page 44]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1FarEndTimeElapsed OBJECT-TYPE
SYNTAX INTEGER (0..899)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds that have elapsed since the
beginning of the far end current error-measurement
period. If, for some reason, such as an
adjustment in the system's time-of-day clock, the
current interval exceeds the maximum value, the
agent will return the maximum value."
::= { dsx1FarEndCurrentEntry 2 }
dsx1FarEndValidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of previous far end intervals for
which data was collected. The value will be
96 unless the interface was brought online within
the last 24 hours, in which case the value will be
the number of complete 15 minute far end intervals
since the interface has been online."
::= { dsx1FarEndCurrentEntry 3 }
dsx1FarEndCurrentESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Errored Seconds."
::= { dsx1FarEndCurrentEntry 4 }
dsx1FarEndCurrentSESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Severely Errored Seconds."
::= { dsx1FarEndCurrentEntry 5 }
dsx1FarEndCurrentSEFSs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
Fowler, Ed. Standards Track [Page 45]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
"The number of Far End Severely Errored Framing
Seconds."
::= { dsx1FarEndCurrentEntry 6 }
dsx1FarEndCurrentUASs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Unavailable Seconds."
::= { dsx1FarEndCurrentEntry 7 }
dsx1FarEndCurrentCSSs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Controlled Slip Seconds."
::= { dsx1FarEndCurrentEntry 8 }
dsx1FarEndCurrentLESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Line Errored Seconds."
::= { dsx1FarEndCurrentEntry 9 }
dsx1FarEndCurrentPCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Path Coding Violations."
::= { dsx1FarEndCurrentEntry 10 }
dsx1FarEndCurrentBESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Bursty Errored Seconds."
::= { dsx1FarEndCurrentEntry 11 }
dsx1FarEndCurrentDMs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
Fowler, Ed. Standards Track [Page 46]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
DESCRIPTION
"The number of Far End Degraded Minutes."
::= { dsx1FarEndCurrentEntry 12 }
dsx1FarEndInvalidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of intervals in the range from 0 to
dsx1FarEndValidIntervals for which no data is
available. This object will typically be zero
except in cases where the data for some intervals
are not available (e.g., in proxy situations)."
::= { dsx1FarEndCurrentEntry 13 }
-- The DS1 Far End Interval Table
dsx1FarEndIntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1FarEndIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 Far End Interval Table contains various
statistics collected by each DS1 interface over
the previous 24 hours of operation. The past 24
hours are broken into 96 completed 15 minute
intervals. Each row in this table represents one
such interval (identified by
dsx1FarEndIntervalNumber) for one specific
instance (identified by dsx1FarEndIntervalIndex)."
::= { ds1 11 }
dsx1FarEndIntervalEntry OBJECT-TYPE
SYNTAX Dsx1FarEndIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Far End Interval table."
INDEX { dsx1FarEndIntervalIndex,
dsx1FarEndIntervalNumber }
::= { dsx1FarEndIntervalTable 1 }
Dsx1FarEndIntervalEntry ::=
SEQUENCE {
dsx1FarEndIntervalIndex InterfaceIndex,
dsx1FarEndIntervalNumber INTEGER,
dsx1FarEndIntervalESs PerfIntervalCount,
Fowler, Ed. Standards Track [Page 47]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1FarEndIntervalSESs PerfIntervalCount,
dsx1FarEndIntervalSEFSs PerfIntervalCount,
dsx1FarEndIntervalUASs PerfIntervalCount,
dsx1FarEndIntervalCSSs PerfIntervalCount,
dsx1FarEndIntervalLESs PerfIntervalCount,
dsx1FarEndIntervalPCVs PerfIntervalCount,
dsx1FarEndIntervalBESs PerfIntervalCount,
dsx1FarEndIntervalDMs PerfIntervalCount,
dsx1FarEndIntervalValidData TruthValue
}
dsx1FarEndIntervalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS1
interface to which this entry is applicable. The
interface identified by a particular value of this
index is identical to the interface identified by
the same value of dsx1LineIndex."
::= { dsx1FarEndIntervalEntry 1 }
dsx1FarEndIntervalNumber OBJECT-TYPE
SYNTAX INTEGER (1..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A number between 1 and 96, where 1 is the most
recently completed 15 minute interval and 96 is
the 15 minutes interval completed 23 hours and 45
minutes prior to interval 1."
::= { dsx1FarEndIntervalEntry 2 }
dsx1FarEndIntervalESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Errored Seconds."
::= { dsx1FarEndIntervalEntry 3 }
dsx1FarEndIntervalSESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Severely Errored Seconds."
Fowler, Ed. Standards Track [Page 48]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
::= { dsx1FarEndIntervalEntry 4 }
dsx1FarEndIntervalSEFSs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Severely Errored Framing
Seconds."
::= { dsx1FarEndIntervalEntry 5 }
dsx1FarEndIntervalUASs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Unavailable Seconds."
::= { dsx1FarEndIntervalEntry 6 }
dsx1FarEndIntervalCSSs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Controlled Slip Seconds."
::= { dsx1FarEndIntervalEntry 7 }
dsx1FarEndIntervalLESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Line Errored Seconds."
::= { dsx1FarEndIntervalEntry 8 }
dsx1FarEndIntervalPCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Path Coding Violations."
::= { dsx1FarEndIntervalEntry 9 }
dsx1FarEndIntervalBESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
Fowler, Ed. Standards Track [Page 49]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
DESCRIPTION
"The number of Far End Bursty Errored Seconds."
::= { dsx1FarEndIntervalEntry 10 }
dsx1FarEndIntervalDMs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Degraded Minutes."
::= { dsx1FarEndIntervalEntry 11 }
dsx1FarEndIntervalValidData OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if the data for this
interval is valid."
::= { dsx1FarEndIntervalEntry 12 }
-- The DS1 Far End Total Table
dsx1FarEndTotalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1FarEndTotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS1 Far End Total Table contains the
cumulative sum of the various statistics for the
24 hour period preceding the current interval."
::= { ds1 12 }
dsx1FarEndTotalEntry OBJECT-TYPE
SYNTAX Dsx1FarEndTotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS1 Far End Total table."
INDEX { dsx1FarEndTotalIndex }
::= { dsx1FarEndTotalTable 1 }
Dsx1FarEndTotalEntry ::=
SEQUENCE {
dsx1FarEndTotalIndex InterfaceIndex,
dsx1FarEndTotalESs PerfTotalCount,
dsx1FarEndTotalSESs PerfTotalCount,
dsx1FarEndTotalSEFSs PerfTotalCount,
Fowler, Ed. Standards Track [Page 50]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1FarEndTotalUASs PerfTotalCount,
dsx1FarEndTotalCSSs PerfTotalCount,
dsx1FarEndTotalLESs PerfTotalCount,
dsx1FarEndTotalPCVs PerfTotalCount,
dsx1FarEndTotalBESs PerfTotalCount,
dsx1FarEndTotalDMs PerfTotalCount
}
dsx1FarEndTotalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS1
interface to which this entry is applicable. The
interface identified by a particular value of this
index is identical to the interface identified by
the same value of dsx1LineIndex."
::= { dsx1FarEndTotalEntry 1 }
dsx1FarEndTotalESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Errored Seconds encountered
by a DS1 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as
0."
::= { dsx1FarEndTotalEntry 2 }
dsx1FarEndTotalSESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Severely Errored Seconds
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1FarEndTotalEntry 3 }
dsx1FarEndTotalSEFSs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
"The number of Far End Severely Errored Framing
Seconds encountered by a DS1 interface in the
previous 24 hour interval. Invalid 15 minute
intervals count as 0."
::= { dsx1FarEndTotalEntry 4 }
dsx1FarEndTotalUASs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Unavailable Seconds encountered by
a DS1 interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx1FarEndTotalEntry 5 }
dsx1FarEndTotalCSSs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Controlled Slip Seconds
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1FarEndTotalEntry 6 }
dsx1FarEndTotalLESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Line Errored Seconds
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1FarEndTotalEntry 7 }
dsx1FarEndTotalPCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Far End Path Coding Violations
reported via the far end block error count
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
::= { dsx1FarEndTotalEntry 8 }
dsx1FarEndTotalBESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Bursty Errored Seconds (BESs)
encountered by a DS1 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx1FarEndTotalEntry 9 }
dsx1FarEndTotalDMs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Degraded Minutes (DMs) encountered
by a DS1 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as
0."
::= { dsx1FarEndTotalEntry 10 }
-- The DS1 Fractional Table
dsx1FracTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx1FracEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"This table is deprecated in favour of using
ifStackTable.
The table was mandatory for systems dividing a DS1
into channels containing different data streams
that are of local interest. Systems which are
indifferent to data content, such as CSUs, need
not implement it.
The DS1 fractional table identifies which DS1
channels associated with a CSU are being used to
support a logical interface, i.e., an entry in the
interfaces table from the Internet-standard MIB.
For example, consider an application managing a
North American ISDN Primary Rate link whose
division is a 384 kbit/s H1 _B_ Channel for Video,
Fowler, Ed. Standards Track [Page 53]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
a second H1 for data to a primary routing peer,
and 12 64 kbit/s H0 _B_ Channels. Consider that
some subset of the H0 channels are used for voice
and the remainder are available for dynamic data
calls.
We count a total of 14 interfaces multiplexed onto
the DS1 interface. Six DS1 channels (for the sake
of the example, channels 1..6) are used for Video,
six more (7..11 and 13) are used for data, and the
remaining 12 are are in channels 12 and 14..24.
Let us further imagine that ifIndex 2 is of type
DS1 and refers to the DS1 interface, and that the
interfaces layered onto it are numbered 3..16.
We might describe the allocation of channels, in
the dsx1FracTable, as follows:
dsx1FracIfIndex.2. 1 = 3 dsx1FracIfIndex.2.13 = 4
dsx1FracIfIndex.2. 2 = 3 dsx1FracIfIndex.2.14 = 6
dsx1FracIfIndex.2. 3 = 3 dsx1FracIfIndex.2.15 = 7
dsx1FracIfIndex.2. 4 = 3 dsx1FracIfIndex.2.16 = 8
dsx1FracIfIndex.2. 5 = 3 dsx1FracIfIndex.2.17 = 9
dsx1FracIfIndex.2. 6 = 3 dsx1FracIfIndex.2.18 = 10
dsx1FracIfIndex.2. 7 = 4 dsx1FracIfIndex.2.19 = 11
dsx1FracIfIndex.2. 8 = 4 dsx1FracIfIndex.2.20 = 12
dsx1FracIfIndex.2. 9 = 4 dsx1FracIfIndex.2.21 = 13
dsx1FracIfIndex.2.10 = 4 dsx1FracIfIndex.2.22 = 14
dsx1FracIfIndex.2.11 = 4 dsx1FracIfIndex.2.23 = 15
dsx1FracIfIndex.2.12 = 5 dsx1FracIfIndex.2.24 = 16
For North American (DS1) interfaces, there are 24
legal channels, numbered 1 through 24.
For G.704 interfaces, there are 31 legal channels,
numbered 1 through 31. The channels (1..31)
correspond directly to the equivalently numbered
time-slots."
::= { ds1 13 }
dsx1FracEntry OBJECT-TYPE
SYNTAX Dsx1FracEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"An entry in the DS1 Fractional table."
INDEX { dsx1FracIndex, dsx1FracNumber }
::= { dsx1FracTable 1 }
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Dsx1FracEntry ::=
SEQUENCE {
dsx1FracIndex INTEGER,
dsx1FracNumber INTEGER,
dsx1FracIfIndex INTEGER
}
dsx1FracIndex OBJECT-TYPE
SYNTAX INTEGER (1..'7fffffff'h)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The index value which uniquely identifies the
DS1 interface to which this entry is applicable
The interface identified by a particular
value of this index is the same interface as
identified by the same value an dsx1LineIndex
object instance."
::= { dsx1FracEntry 1 }
dsx1FracNumber OBJECT-TYPE
SYNTAX INTEGER (1..31)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The channel number for this entry."
::= { dsx1FracEntry 2 }
dsx1FracIfIndex OBJECT-TYPE
SYNTAX INTEGER (1..'7fffffff'h)
MAX-ACCESS read-write
STATUS deprecated
DESCRIPTION
"An index value that uniquely identifies an
interface. The interface identified by a particular
value of this index is the same interface
as identified by the same value an ifIndex
object instance. If no interface is currently using
a channel, the value should be zero. If a
single interface occupies more than one time
slot, that ifIndex value will be found in multiple
time slots."
::= { dsx1FracEntry 3 }
-- Ds1 TRAPS
ds1Traps OBJECT IDENTIFIER ::= { ds1 15 }
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1LineStatusChange NOTIFICATION-TYPE
OBJECTS { dsx1LineStatus,
dsx1LineStatusLastChange }
STATUS current
DESCRIPTION
"A dsx1LineStatusChange trap is sent when the
value of an instance dsx1LineStatus changes. It
can be utilized by an NMS to trigger polls. When
the line status change results from a higher level
line status change (i.e. ds3), then no traps for
the ds1 are sent."
::= { ds1Traps 0 1 }
-- conformance information
ds1Conformance OBJECT IDENTIFIER ::= { ds1 14 }
ds1Groups OBJECT IDENTIFIER ::= { ds1Conformance 1 }
ds1Compliances OBJECT IDENTIFIER ::= { ds1Conformance 2 }
-- compliance statements
ds1Compliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for T1 and E1
interfaces."
MODULE -- this module
MANDATORY-GROUPS { ds1NearEndConfigGroup,
ds1NearEndStatisticsGroup }
GROUP ds1FarEndGroup
DESCRIPTION
"Implementation of this group is optional for all
systems that attach to a DS1 Interface."
GROUP ds1NearEndOptionalConfigGroup
DESCRIPTION
"Implementation of this group is optional for all
systems that attach to a DS1 Interface."
GROUP ds1DS2Group
DESCRIPTION
"Implementation of this group is mandatory for all
systems that attach to a DS2 Interface."
GROUP ds1TransStatsGroup
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
DESCRIPTION
"This group is the set of statistics appropriate
for all systems which attach to a DS1 Interface
running transparent or unFramed lineType."
GROUP ds1ChanMappingGroup
DESCRIPTION
"This group is the set of objects for mapping a
DS3 Channel (ds1ChannelNumber) to ifIndex.
Implementation of this group is mandatory for
systems which support the channelization of DS3s
into DS1s."
OBJECT dsx1LineType
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the line type is not
required."
OBJECT dsx1LineCoding
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the line coding is not
required."
OBJECT dsx1SendCode
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the send code is not
required."
OBJECT dsx1LoopbackConfig
MIN-ACCESS read-only
DESCRIPTION
"The ability to set loopbacks is not required."
OBJECT dsx1SignalMode
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the signal mode is not
required."
OBJECT dsx1TransmitClockSource
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the transmit clock source is
Fowler, Ed. Standards Track [Page 57]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
not required."
OBJECT dsx1Fdl
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the FDL is not required."
OBJECT dsx1LineLength
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the line length is not
required."
OBJECT dsx1Channelization
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the channelization is not
required."
::= { ds1Compliances 1 }
ds1MibT1PriCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for using this MIB for ISDN
Primary Rate interfaces on T1 lines."
MODULE
MANDATORY-GROUPS { ds1NearEndConfigGroup,
ds1NearEndStatisticsGroup }
OBJECT dsx1LineType
SYNTAX INTEGER {
dsx1ESF(2) -- Intl Spec would be G704(2)
-- or I.431(4)
}
MIN-ACCESS read-only
DESCRIPTION
"Line type for T1 ISDN Primary Rate
interfaces."
OBJECT dsx1LineCoding
SYNTAX INTEGER {
dsx1B8ZS(2)
}
MIN-ACCESS read-only
DESCRIPTION
"Type of Zero Code Suppression for
T1 ISDN Primary Rate interfaces."
OBJECT dsx1SignalMode
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
SYNTAX INTEGER {
none(1), -- if there is no signaling channel
messageOriented(4)
}
MIN-ACCESS read-only
DESCRIPTION
"Possible signaling modes for
T1 ISDN Primary Rate interfaces."
OBJECT dsx1TransmitClockSource
SYNTAX INTEGER {
loopTiming(1)
}
MIN-ACCESS read-only
DESCRIPTION
"The transmit clock is derived from
received clock on ISDN Primary Rate
interfaces."
OBJECT dsx1Fdl
MIN-ACCESS read-only
DESCRIPTION
"Facilities Data Link usage on T1 ISDN
Primary Rate interfaces.
Note: Eventually dsx1Att-54016(4) is to be
used here since the line type is ESF."
OBJECT dsx1Channelization
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the channelization
is not required."
::= { ds1Compliances 2 }
ds1MibE1PriCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for using this MIB for ISDN
Primary Rate interfaces on E1 lines."
MODULE
MANDATORY-GROUPS { ds1NearEndConfigGroup,
ds1NearEndStatisticsGroup }
OBJECT dsx1LineType
SYNTAX INTEGER {
dsx1E1CRC(5)
}
MIN-ACCESS read-only
Fowler, Ed. Standards Track [Page 59]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
DESCRIPTION
"Line type for E1 ISDN Primary Rate
interfaces."
OBJECT dsx1LineCoding
SYNTAX INTEGER {
dsx1HDB3(3)
}
MIN-ACCESS read-only
DESCRIPTION
"Type of Zero Code Suppression for
E1 ISDN Primary Rate interfaces."
OBJECT dsx1SignalMode
SYNTAX INTEGER {
messageOriented(4)
}
MIN-ACCESS read-only
DESCRIPTION
"Signaling on E1 ISDN Primary Rate interfaces
is always message oriented."
OBJECT dsx1TransmitClockSource
SYNTAX INTEGER {
loopTiming(1)
}
MIN-ACCESS read-only
DESCRIPTION
"The transmit clock is derived from received
clock on ISDN Primary Rate interfaces."
OBJECT dsx1Fdl
MIN-ACCESS read-only
DESCRIPTION
"Facilities Data Link usage on E1 ISDN
Primary Rate interfaces.
Note: There is a 'M-Channel' in E1,
using National Bit Sa4 (G704,
Table 4a). It is used to implement
management features between ET
and NT. This is different to
FDL in T1, which is used to carry
control signals and performance
data. In E1, control and status
signals are carried using National
Bits Sa5, Sa6 and A (RAI Ind.).
This indicates that only the other(1) or
eventually the dsx1Fdl-none(8) bits should
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
be set in this object for E1 PRI."
OBJECT dsx1Channelization
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the channelization is not
required."
::= { ds1Compliances 3 }
ds1Ds2Compliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for using this MIB for DS2
interfaces."
MODULE
MANDATORY-GROUPS { ds1DS2Group }
OBJECT dsx1Channelization
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the channelization is not
required."
::= { ds1Compliances 4 }
-- units of conformance
ds1NearEndConfigGroup OBJECT-GROUP
OBJECTS { dsx1LineIndex,
dsx1TimeElapsed,
dsx1ValidIntervals,
dsx1LineType,
dsx1LineCoding,
dsx1SendCode,
dsx1CircuitIdentifier,
dsx1LoopbackConfig,
dsx1LineStatus,
dsx1SignalMode,
dsx1TransmitClockSource,
dsx1Fdl,
dsx1InvalidIntervals,
dsx1LineLength,
dsx1LoopbackStatus,
dsx1Ds1ChannelNumber,
dsx1Channelization }
STATUS current
DESCRIPTION
"A collection of objects providing configuration
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information applicable to all DS1 interfaces."
::= { ds1Groups 1 }
ds1NearEndStatisticsGroup OBJECT-GROUP
OBJECTS { dsx1CurrentIndex,
dsx1CurrentESs,
dsx1CurrentSESs,
dsx1CurrentSEFSs,
dsx1CurrentUASs,
dsx1CurrentCSSs,
dsx1CurrentPCVs,
dsx1CurrentLESs,
dsx1CurrentBESs,
dsx1CurrentDMs,
dsx1CurrentLCVs,
dsx1IntervalIndex,
dsx1IntervalNumber,
dsx1IntervalESs,
dsx1IntervalSESs,
dsx1IntervalSEFSs,
dsx1IntervalUASs,
dsx1IntervalCSSs,
dsx1IntervalPCVs,
dsx1IntervalLESs,
dsx1IntervalBESs,
dsx1IntervalDMs,
dsx1IntervalLCVs,
dsx1IntervalValidData,
dsx1TotalIndex,
dsx1TotalESs,
dsx1TotalSESs,
dsx1TotalSEFSs,
dsx1TotalUASs,
dsx1TotalCSSs,
dsx1TotalPCVs,
dsx1TotalLESs,
dsx1TotalBESs,
dsx1TotalDMs,
dsx1TotalLCVs }
STATUS current
DESCRIPTION
"A collection of objects providing statistics
information applicable to all DS1 interfaces."
::= { ds1Groups 2 }
ds1FarEndGroup OBJECT-GROUP
OBJECTS { dsx1FarEndCurrentIndex,
dsx1FarEndTimeElapsed,
Fowler, Ed. Standards Track [Page 62]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
dsx1FarEndValidIntervals,
dsx1FarEndCurrentESs,
dsx1FarEndCurrentSESs,
dsx1FarEndCurrentSEFSs,
dsx1FarEndCurrentUASs,
dsx1FarEndCurrentCSSs,
dsx1FarEndCurrentLESs,
dsx1FarEndCurrentPCVs,
dsx1FarEndCurrentBESs,
dsx1FarEndCurrentDMs,
dsx1FarEndInvalidIntervals,
dsx1FarEndIntervalIndex,
dsx1FarEndIntervalNumber,
dsx1FarEndIntervalESs,
dsx1FarEndIntervalSESs,
dsx1FarEndIntervalSEFSs,
dsx1FarEndIntervalUASs,
dsx1FarEndIntervalCSSs,
dsx1FarEndIntervalLESs,
dsx1FarEndIntervalPCVs,
dsx1FarEndIntervalBESs,
dsx1FarEndIntervalDMs,
dsx1FarEndIntervalValidData,
dsx1FarEndTotalIndex,
dsx1FarEndTotalESs,
dsx1FarEndTotalSESs,
dsx1FarEndTotalSEFSs,
dsx1FarEndTotalUASs,
dsx1FarEndTotalCSSs,
dsx1FarEndTotalLESs,
dsx1FarEndTotalPCVs,
dsx1FarEndTotalBESs,
dsx1FarEndTotalDMs }
STATUS current
DESCRIPTION
"A collection of objects providing remote
configuration and statistics information."
::= { ds1Groups 3 }
ds1DeprecatedGroup OBJECT-GROUP
OBJECTS { dsx1IfIndex,
dsx1FracIndex,
dsx1FracNumber,
dsx1FracIfIndex }
STATUS deprecated
DESCRIPTION
"A collection of obsolete objects that may be
implemented for backwards compatibility."
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
::= { ds1Groups 4 }
ds1NearEndOptionalConfigGroup OBJECT-GROUP
OBJECTS { dsx1LineStatusLastChange,
dsx1LineStatusChangeTrapEnable }
STATUS current
DESCRIPTION
"A collection of objects that may be implemented
on DS1 and DS2 interfaces."
::= { ds1Groups 5 }
ds1DS2Group OBJECT-GROUP
OBJECTS { dsx1LineIndex,
dsx1LineType,
dsx1LineCoding,
dsx1SendCode,
dsx1LineStatus,
dsx1SignalMode,
dsx1TransmitClockSource,
dsx1Channelization }
STATUS current
DESCRIPTION
"A collection of objects providing information
about DS2 (6,312 kbps) and E2 (8,448 kbps)
systems."
::= { ds1Groups 6 }
ds1TransStatsGroup OBJECT-GROUP
OBJECTS { dsx1CurrentESs,
dsx1CurrentSESs,
dsx1CurrentUASs,
dsx1IntervalESs,
dsx1IntervalSESs,
dsx1IntervalUASs,
dsx1TotalESs,
dsx1TotalSESs,
dsx1TotalUASs }
STATUS current
DESCRIPTION
"A collection of objects which are the
statistics which can be collected from a ds1
interface that is running transparent or unframed
lineType. Statistics not in this list should
return noSuchInstance."
::= { ds1Groups 7 }
ds1NearEndOptionalTrapGroup NOTIFICATION-GROUP
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
NOTIFICATIONS { dsx1LineStatusChange }
STATUS current
DESCRIPTION
"A collection of notifications that may be
implemented on DS1 and DS2 interfaces."
::= { ds1Groups 8 }
ds1ChanMappingGroup OBJECT-GROUP
OBJECTS { dsx1ChanMappedIfIndex }
STATUS current
DESCRIPTION
"A collection of objects that give an mapping of
DS3 Channel (ds1ChannelNumber) to ifIndex."
::= { ds1Groups 9 }
END
Fowler, Ed. Standards Track [Page 65]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
4. Appendix A - Use of dsx1IfIndex and dsx1LineIndex
This Appendix exists to document the previous use if dsx1IfIndex and
dsx1LineIndex and to clarify the relationship of dsx1LineIndex as
defined in rfc1406 with the dsx1LineIndex as defined in this
document.
The following shows the old and new definitions and the relationship:
[New Definition]: "This object should be made equal to ifIndex. The
next paragraph describes its previous usage. Making the object equal
to ifIndex allows proper use of ifStackTable and ds0/ds0bundle mibs.
[Old Definition]: "This object is the identifier of a DS1 Interface
on a managed device. If there is an ifEntry that is directly
associated with this and only this DS1 interface, it should have the
same value as ifIndex. Otherwise, number the dsx1LineIndices with an
unique identifier following the rules of choosing a number that is
greater than ifNumber and numbering the inside interfaces (e.g.,
equipment side) with even numbers and outside interfaces (e.g,
network side) with odd numbers."
When the "Old Definition" was created, it was described this way to
allow a manager to treat the value _as if_ it were and ifIndex, i.e.
the value would either be: 1) an ifIndex value or 2) a value that
was guaranteed to be different from all valid ifIndex values.
The new definition is a subset of that definition, i.e. the value is
always an ifIndex value.
The following is Section 3.1 from rfc1406:
Different physical configurations for the support of SNMP with DS1
equipment exist. To accommodate these scenarios, two different
indices for DS1 interfaces are introduced in this MIB. These indices
are dsx1IfIndex and dsx1LineIndex.
External interface scenario: the SNMP Agent represents all managed
DS1 lines as external interfaces (for example, an Agent residing on
the device supporting DS1 interfaces directly):
For this scenario, all interfaces are assigned an integer value equal
to ifIndex, and the following applies:
ifIndex=dsx1IfIndex=dsx1LineIndex for all interfaces.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
The dsx1IfIndex column of the DS1 Configuration table relates each
DS1 interface to its corresponding interface (ifIndex) in the
Internet-standard MIB (MIB-II STD 17, RFC1213).
External&Internal interface scenario: the SNMP Agents resides on an
host external from the device supporting DS1 interfaces (e.g., a
router). The Agent represents both the host and the DS1 device. The
index dsx1LineIndex is used to not only represent the DS1 interfaces
external from the host/DS1-device combination, but also the DS1
interfaces connecting the host and the DS1 device. The index
dsx1IfIndex is always equal to ifIndex.
Example:
A shelf full of CSUs connected to a Router. An SNMP Agent residing on
the router proxies for itself and the CSU. The router has also an
Ethernet interface:
+-----+
| | |
| | | +---------------------+
|E | | 1.544 MBPS | Line#A | DS1 Link
|t | R |---------------+ - - - - - - - - - +------>
|h | | | |
|e | O | 1.544 MBPS | Line#B | DS1 Link
|r | |---------------+ - - - - - - - - - - +------>
|n | U | | CSU Shelf |
|e | | 1.544 MBPS | Line#C | DS1 Link
|t | T |---------------+ - - - -- -- - - - - +------>
| | | | |
|-----| E | 1.544 MBPS | Line#D | DS1 Link
| | |---------------+ - - - - -- - - - - +------>
| | R | |_____________________|
| | |
| +-----+
The assignment of the index values could for example be:
ifIndex (= dsx1IfIndex) dsx1LineIndex
1 NA NA (Ethernet)
2 Line#A Router Side 6
2 Line#A Network Side 7
3 Line#B Router Side 8
3 Line#B Network Side 9
4 Line#C Router Side 10
Fowler, Ed. Standards Track [Page 67]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
4 Line#C Network Side 11
5 Line#D Router Side 12
5 Line#D Network Side 13
For this example, ifNumber is equal to 5. Note the following
description of dsx1LineIndex: the dsx1LineIndex identifies a DS1
Interface on a managed device. If there is an ifEntry that is
directly associated with this and only this DS1 interface, it should
have the same value as ifIndex. Otherwise, number the
dsx1LineIndices with an unique identifier following the rules of
choosing a number greater than ifNumber and numbering inside
interfaces (e.g., equipment side) with even numbers and outside
interfaces (e.g., network side) with odd numbers.
If the CSU shelf is managed by itself by a local SNMP Agent, the
situation would be:
ifIndex (= dsx1IfIndex) dsx1LineIndex
1 Line#A Network Side 1
2 Line#A RouterSide 2
3 Line#B Network Side 3
4 Line#B RouterSide 4
5 Line#C Network Side 5
6 Line#C Router Side 6
7 Line#D Network Side 7
8 Line#D Router Side 8
Fowler, Ed. Standards Track [Page 68]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
5. Appendix B - The delay approach to Unavialable Seconds.
This procedure is illustrated below for a DS1 ESF interface. Similar
rules would apply for other DS1, DS2, and E1 interface variants. The
procedure guarantees that the statistical counters are correctly
updated at all times, although they lag real time by 10 seconds. At
the end of each 15 minutes interval the current interval counts are
transferred to the most recent interval entry and each interval is
shifted up by one position, with the oldest being discarded if
necessary in order to make room. The current interval counts then
start over from zero. Note, however, that the signal state
calculation does not start afresh at each interval boundary; rather,
signal state information is retained across interval boundaries.
+---------------------------------------------------------------------+
| READ COUNTERS & STATUS INFO FROM HARDWARE |
| |
| BPV EXZ LOS FE CRC CS AIS SEF OOF LOF RAI G1-G6 SE FE LV SL |
+---------------------------------------------------------------------+
| | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | |
V V V V V V V V V V V V V V V V
+---------------------------------------------------------------------+
| ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE |
| |
| |<---------- NEAR END ----------->| |<-------- FAR END ------>| |
| |
| LCV LES PCV ES CSS BES SES SEFS A/U PCV ES CSS BES SES SEFS A/U |
+---------------------------------------------------------------------+
| | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | |
V V V V V V V V | V V V V V V |
+------------------------------+ | +----------------------+ |
| ONE-SEC DELAY | | | ONE-SEC DELAY | |
| (1 OF 10) | | | (1 OF 10) | |
+------------------------------+ | +----------------------+ |
| | | | | | | | | | | | | | | |
/ / / / / / / / / / / / / / / /
| | | | | | | | | | | | | | | |
V V V V V V V V | V V V V V V |
+------------------------------+ | +----------------------+ |
| ONE-SEC DELAY | | | ONE-SEC DELAY | |
| (10 OF 10) | | | (10 OF 10) | |
+------------------------------+ | +----------------------+ |
| | | | | | | | | | | | | | | |
V V V V V V V V V V V V V V V V
Fowler, Ed. Standards Track [Page 69]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
+---------------------------------------------------------------------+
| UPDATE STATISTICS COUNTERS |
| |
|<-------------- NEAR END ----------->| |<--------- FAR END --------->|
| |
|LCV LES PCV ES CSS BES SES SEFS UAS DM PCV ES CSS BES SES SEFS UAS DM|
+---------------------------------------------------------------------+
Note that if such a procedure is adopted there is no current interval
data for the first ten seconds after a system comes up.
noSuchInstance must be returned if a management station attempts to
access the current interval counters during this time.
It is an implementation-specific matter whether an agent assumes that
the initial state of the interface is available or unavailable.
6. Intellectual Property
The IETF takes no position regarding the validity or scope of any
intellectual property or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; neither does it represent that it
has made any effort to identify any such rights. Information on the
IETF's procedures with respect to rights in standards-track and
standards-related documentation can be found in BCP-11. Copies of
claims of rights made available for publication and any assurances of
licenses to be made available, or the result of an attempt made to
obtain a general license or permission for the use of such
proprietary rights by implementors or users of this specification can
be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights which may cover technology that may be required to practice
this standard. Please address the information to the IETF Executive
Director.
7. Acknowledgments
This document was produced by the Trunk MIB Working Group.
Fowler, Ed. Standards Track [Page 70]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
8. References
[1] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for
Describing SNMP Management Frameworks", RFC 2271, January 1998.
[2] Rose, M. and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based Internets", STD 16, RFC
1155, May 1990.
[3] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
RFC 1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with the
SNMP", RFC 1215, March 1991.
[5] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Structure
of Management Information for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1902, January 1996.
[6] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Textual
Conventions for Version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1903, January 1996.
[7] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
"Conformance Statements for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1904, January 1996.
[8] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
Network Management Protocol", STD 15, RFC 1157, May 1990.
[9] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
"Introduction to Community-based SNMPv2", RFC 1901, January
1996.
[10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport
Mappings for Version 2 of the Simple Network Management Protocol
(SNMPv2)", RFC 1906, January 1996.
[11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
Processing and Dispatching for the Simple Network Management
Protocol (SNMP)", RFC 2272, January 1998.
[12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
for version 3 of the Simple Network Management Protocol
(SNMPv3)", RFC 2274, January 1998.
Fowler, Ed. Standards Track [Page 71]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
[13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol
Operations for Version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1905, January 1996.
[14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC
2273, January 1998.
[15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
Control Model (VACM) for the Simple Network Management Protocol
(SNMP)", RFC 2275, January 1998.
[16] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB
using SMIv2", RFC 2233, November 1997.
[17] AT&T Information Systems, AT&T ESF DS1 Channel Service Unit
User's Manual, 999-100-305, February 1988.
[18] AT&T Technical Reference, Requirements for Interfacing Digital
Terminal Equipment to Services Employing the Extended Superframe
Format, Publication 54016, May 1988.
[19] American National Standard for Telecommunications -- Carrier-to-
Customer Installation - DS1 Metallic Interface, T1.403, February
1989.
[20] CCITT Specifications Volume III, Recommendation G.703,
Physical/Electrical Characteristics of Hierarchical Digital
Interfaces, April 1991.
[21] ITU-T G.704: Synchronous frame structures used at 1544, 6312,
2048, 8488 and 44 736 kbit/s Hierarchical Levels, July 1995.
[22] American National Standard for Telecommunications -- Digital
Hierarchy -- Layer 1 In-Service Digital Transmission Performace
Monitoring, T1.231, Sept 1993.
[23] CCITT Specifications Volume IV, Recommendation O.162, Equipment
To Perform In Service Monitoring On 2048 kbit/s Signals, July
1988.
[24] CCITT Specifications Volume III, Recommendation G.821, Error
Performance Of An International Digital Connection Forming Part
Of An Integrated Services Digital Network, July 1988.
[25] AT&T Technical Reference, Technical Reference 62411, ACCUNET
T1.5 Service Description And Interface Specification, December
1990.
Fowler, Ed. Standards Track [Page 72]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
[26] CCITT Specifications Volume III, Recommendation G.706, Frame
Alignment and Cyclic Redundancy Check (CRC) Procedures Relating
to Basic Frame Structures Defined in Recommendation G.704, July
1988.
[27] CCITT Specifications Volume III, Recommendation G.732,
Characteristics Of Primary PCM Multiplex Equipment Operating at
2048 kbit/s, July 1988.
[28] Fowler, D., "Definitions of Managed Objects for the DS3/E3
Interface Types", RFC 2496, Janaury 1999.
[29] Brown, T., and Tesink, K., "Definitions of Managed Objects for
the SONET/SDH Interface Type", Work in Progress.
[30] Fowler, D., "Definitions of Managed Objects for the Ds0 and
DS0Bundle Interface Types", RFC 2494, January 1999.
[31] ITU-T G.775: Loss of signal (LOS) and alarm indication signal
(AIS) defect detection and clearance criteria, May 1995.
[32] ITU-T G.826: Error performance parameters and objectives for
international, constant bit rate digital paths at or above the
primary rate, November 1993.
[33] American National Standard for Telecommunications -- Digital
Hierarchy - Electrical Interfaces, T1.102, December 1993.
[34] American National Standard for Telecommunications -- Digital
Hierarchy - Format Specifications, T1.107, August 1988.
[35] Tesink, K., "Textual Conventions for MIB Modules Using
Performance History Based on 15 Minute Intervals", RFC XXXX,
January 1999.
9. Security Considerations
SNMPv1 by itself is such an insecure environment. Even if the
network itself is secure (for example by using IPSec), even then,
there is no control as to who on the secure network is allowed to
access and GET (read) the objects in this MIB.
It is recommended that the implementors consider the security
features as provided by the SNMPv3 framework. Specifically, the use
of the User-based Security Model RFC 2274 [12] and the View-based
Access Control Model RFC 2275 [15] is recommended.
Fowler, Ed. Standards Track [Page 73]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
It is then a customer/user responsibility to ensure that the SNMP
entity giving access to an instance of this MIB, is properly
configured to give access to those objects only to those principals
(users) that have legitimate rights to access them.
Setting any of the following objects to an inappropriate value can
cause loss of traffic. The definition of inappropriate varies for
each object. In the case of dsx1LineType, for example, both ends of
a ds1/e1 must have the same value in order for traffic to flow. In
the case of dsx1SendCode and dsx1LoopbackConfig, for another example,
traffic may stop transmitting when particular loopbacks are applied.
dsx1LineType
dsx1LineCoding
dsx1SendCode
dsx1LoopbackConfig
dsx1SignalMode
dsx1TransmitClockSource
dsx1Fdl
dsx1LineLength
dsx1Channelization
Setting the following object is mischevious, but not harmful to
traffic.
dsx1CircuitIdentifier
Setting the following object can cause an increase in the number of
traps received by the network management station.
dsx1LineStatusChangeTrabEnable
10. Author's Address
David Fowler
Newbridge Networks
600 March Road
Kanata, Ontario, Canada K2K 2E6
Phone: (613) 599-3600, ext 6559
EMail: davef@newbridge.com
Fowler, Ed. Standards Track [Page 74]
RFC 2495 DS1/E1/DS2/E2 MIB January 1999
11. Full Copyright Statement
Copyright (C) The Internet Society (1999). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Fowler, Ed. Standards Track [Page 75]