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This is an ORIGINAL file from P-80 Systems... << TSPS COIN CONTROL SIGNALS >> from: <S><C><A><N><*><M><A><N> Over the years several different methods of coin control have evolved to meet the changing needs. In addition to coin collect, coin return, and ringback the newer MW and expanded inband methods provide signals to control the polarity of the battery applied to the coin telephone by the local office. The ACTS and Calling Card Service features of TSPS make use of the additional signals. In some cases two back-to-back signals spaced by a guard interval (required to give the local office time to respond) are used. Guard intervals are also neccesary between coin control signals, machine generated announcements, and certain other suprivisory signals. There are FOUR different methods of coin control and ringback signaling used from TSPS-TO THE LOCAL CENTRAL OFFICE. They are POLAR MARGINAL, INBAND, MW, and EXPANDED INBAND SIGNALING (EIS) coin control. all but polar marginal coin control can be used from a remote trunking arrangement (RTA) to the local central office and can be used with E&M lead signaling on other physical or carrier facilities. All four types of coin control can be used with 2-wire physical facilities employing loop, high-low, reverse battery signaling. In addition all fout types of coin control can be used with all TSPS features (except RTA). However with Calling Card service, only MW and EIS coin control provide DTMF pad and totalizer control without station set modifications. For those of you that are unaware of the totalizers fuction it is simply to keep track of the total coin input and has both a LOCAL and TOLL mode. There are two types of coin telephones manufactured by Western Electric used for prepaid coin service. the older is COIN FIRST, the newer is DIAL TONE FIRST. COIN FIRST ---- ----- These coin phones use a negative battery supply (usually -48 voltson the ring and ground on the tip but can be other voltages,eg, when range extenders are not used) from the local central office. They do not require a positive battery supply (+48 volts on the ring and ground on the tip). If equipped with DTMF, the DTMF pad is diabled unless an initial deposit equal to the local rate has been made. When the deposite is collected or returned, the DTMF pad is again placed in the disabled state. A feature called coin return has been provided for DTMF pad enablement with coin first telephones and is required for Calling Card service. Dial Tone First ---- ---- ----- These coin telephones initially have the DTMF pad enabled and a negative battery supplied similar to the coin first telephones. However, the negative battery places the coin totalizer in the C-series sets in local mode,ie, the readout does not occur until an amount equal to the initial rate s deposited. This can result in composite coin signals which may not be recognized by operators or ACTS. In D-series sets the negative battery gives the DTMF pad priority over coin signals! Thus pad operation during coin deposite may result in coin signal errors at the TSPS. A positive battery supply (+48 volts on the ring and ground on the tip) is neede from the local central office when acoin deposite is requested by TSPS. The positive battery supply changes the coin totalizer in the C-series sets to the TOLL MODE, so that coin deposites of any denomination cause an immediate readout which can be detected by an operator or ACTS equipment. In the D-series sets, it gives priority to the coin deposites thus preventing DTMF pad interference. The positive battery supply also dia bles the DTMF pad on ALL BUT TYPE D of dial tone first type fones. Disabling the DTMF pad during coin deposites prior to ACTS was desirable to PREVENT SIMULATION OF COIN TONES WITH THE PAD!!!!! However, with ACTS the coin tone recievers used at TSPS will not respond to DTMF signals so the DTMF pad disabling function is no longer neccesary. NOTE: If a positive battery were applied to an A-series coin first telephone, the DTMF pad and coin totalizer would fail to function. Now we shall discuss in some detail the four types of coin control. POLAR MARGINAL COIN CONTROL ----- -------- ---- ------- (signals) <1> The polar marginal coin control uses the following signals for coin control and ringback. (a) COIN COLLECT: +130 volts tip and -48 volts ring (b) COIN RETURN: -48 volts tip and +130 volts ring (c) RINGBACK: ground on tip and -48 volts ring and ground on ring for 50 to 100 milliseconds alternatly for the duration of the ringback signal (approx: 2-2.5 seconds). RINGBACK PROTOCOL: When ringback is used at the end of a call, the signal is repeated up to five times or untill off-hook suprivision from the local office is detected. The siganals are spaced at approxamately 4-second intervals. If the local office remains on-hook after five ringback signals have been sent,TSPS sends a coin return signal and then releases the connection (goes on-hook toward the local office). The release back will occur no sooner than 300 milliseconds after the coin control signal. <2> INBAND COIN CONTROL (signals) Inband coin control uses MF signals to control coins and ringback the coin station as follows: (a) COIN COLLECT: 700+1100 HZ (b) COIN RETURN: 1100+1700 HZ (c) RINGBACK: 700+1700 HZ An on-hook wink (off-hook,on-hook,off-hook) of 70 to 130 milliseconds is sent (50 to 100 in duration when recieved) from the TSPS equipment to alert the local central office to prepare a reciever for the MF signal that begins 95 to 195 milliseconds after the end of the wink. The MF signal will persist for approxamately 1 second for COLLECT & RETURN and 2 second for RINGBACK. The reciever requirements are are the same as for regular MF pulsing. RINGBACK PROTOCOL: The ringback protocol is the same as described in the POLAR MARGINAL coin control. It is used in step-by-step,NO.5 crossbar,NO.3ESS,and NO.5ESS switching equipment. I would like to take this oportunity to remind you this is an original file from P-80 Systems, and credits should not be removed from this file when posting on other systems!!! <3> MW COIN CONTROL MW coin control uses multiple on-hook wink signals sent from TSPS to a local central office. It is used in step-by-step,NO.5 crossbar,NO.3ESS and NO.5ESS switching systems, and by DMS-10 and DMS-100F digital switching systems. In addition to providing coin collect,coin return and ringback signals, this signaling format provides two additional signals, called OPERATOR-ATTACHED and OPERATOR-RELEASED. the operator-attached signal is used with dial tone first coin telephones to instruct the local office to change the mode of the coin totalizer or coin signaling priority to the TOLL mode by application of positive battery to the coin telephone (see first two paragraphs of this article). IT is not sent the first time a coin call is forwarded to TSPS ((contrary to:Notes On Distance Dialing 1975)for those of you that have it) because the local central office is expected to connect a coin call to the TSPS in the OPERATOR-ATTACHED condition. However, the operator-attached signal is sent before each subsequent TSPS attachment requiring a coin deposite. The OPERATOR-RELEASED signal (negative battery supplied to the payphone) restores the coin totalizer or coin signaling priority to the LOCAL mode and and enables the DTMF pad on certain payphones. The OPERATOR-RELEASED signal is sent whenever TSPS releases from a connection having a positive battery applied to the payphone. It is also sent upon initial connection to a 0+ coin call on a DIAL-TONE-FIRST trunk when the trunk provides for calling card service!!! (signals) The MW signaling format uses a series of 1 to 5 suprivisory on-hook winks from the TSPS to the local office outgoing trunks. The signals and there functions are as follows: Number of Use or on-hook winks Function 1 OPERATOR-RELEASED 2 OPERATOR-ATTACHED 3 COIN COLLECT 4 COIN RETURN 5 RINGBACK The wink on-hook intervals as sent by the TSPS are 70 to 130 milliseconds and the wink off-hook intervals are 95 to 150 milliseconds. To allow for pulse distortion, the local central office trunk should be CAPABLE of operating with on-hook intervals from 50 to 150 milliseconds spaced from 75 to 185 milliseconds apart when recieved !!! At the end of a wink signal, the TSPS will allow time for the locale central office to complete detection and application of the signal before sending a new signal. The minimum interval after sending a signal by TSPS and the maximum time in which the local central office (CO) must detect and apply the signal are as follows: . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUBSEQUENT LOCAL OFFICE. . TSPS GUARD INTERVALS WORK TIME . .TSPS SIGNAL (minimum) (maximum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .oper.-attached 500-MS 380-MS . . . .oper.-released 500-MS 380-MS . . . .coin collect 1.1 seconds 880-MS . . . .coin return 1.1 seconds 880-MS . . . .ringback 2.4 seconds 2.1 seconds . . . .MS= Milliseconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . RINGBACK PROTOCOL: is the same as with MARGINAL POLAR ringback protocol. <4> EIS COIN CONTROL As with INBAND COIN CONTROL, EIS (expanded inband service) coin control uses an on-hook wink to alert the local central office that MF tones will be sent (to elaborate the wink serves the same function as KP when boxing, it simply tells the system that digits (MF tones) will be sent). IT is used in the NO. 1/1A ESS, NO.2/2B ESS, and NO.5 ESS switching systems, and the DMS-100F digital switching systems. With EIS, the wink is being extended to produce an on-hook of between 325 and 425 milliseconds (300 and 450 milliseconds when recieved). In addition the interval between the end of the wink signal and the start of the MF tones is being lenthend to a value of between 770 and 850 milliseconds while the duration of the tones is being reproduced to a value of between 480 and 700 milliseconds. (signals) TSPS is able to work with EIS after TSPS GENERIC 1T10 or GENERIC 1BT1 is installed. (GENERIC PROGRAM (software)=a set of instructions for an electronic switching system that is the same for all offices using that type of switching system. Detailed differences for each individual office will occur). The first instalation of this program occured in mid-1980. Each TSPS in use today should now have this change. The actual signaling is as follows: . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . SUBSEQUENT TSPS . . FUNCTION MF FREQUENCIES GUARD INTERVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .oper.-released 900 + 1500 (HZ) 600 milliseconds. . . .oper.-attached 1300+ 1500 (HZ) 600 milliseconds. . . .coin collect 700 + 1100 (HZ) 2 seconds . . . .coin return 1100+ 1700 (HZ) 2 seconds . . . .ringback 700 + 1700 (HZ) 2 seconds . . . .coin collect & 1500+ 1700 (HZ) 2 seconds . .oper.-released . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EIS also provides operator attached and operator released signals as does MW (multiwink) coin control. However in eis a coin station innitiating a 0+,0- or non-chargable call on a trunk providing CALLING CARD SERVICE is initially connected to the TSPS with negative battery applied to the station. AS with the other signaling methods, 1+ calls are initially connected with positive battery applied. THE operator attached signal is sent whenever the TSPS is connected for a coin deposit, and the operator released signal is sent whenever the TSPS is released from a connection having positive battery applied to the coin station. There is a new signal not available with MW, which is combined coin collect operator released. This signal which causes the local office to collect coins then apply negative battery to the coin station, is currently used for interim overtime collections still in the talking state. RINGBACK PROTOCOL: EIS uses a different ringback protocol than the other coin control signaling methods. The TSPS sends one ringback signal. The local office applies standard ringing (2 seconds on, 4 seconds off) to the station and an audible ring toward the TSPS until the station answers or TSPS is released and recieved. The TSPS times for 30-36 seconds waiting for an answer. If answer is not recieved TSPS releases back. The local office performs a coin return before releasing the coin station. If answer is recieved and coin control signal sent, release back will not occur until at least 300 milliseconds after completion of the signal. IN CLOSING-- I sincerly hope that this article has been of some assistance to all. Remember this is another original file from P-80 Systems & <S><C><A><N><*><M><A><N>