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AST RESEARCH TECHNICAL BULLETIN TB-0134 11-11-85
AST-3780 TROUBLESHOOTING
The intent of this Technical Bulletin is to help the installer of
AST-3780 isolate any problems which may arise. The bulletin
will cover the situations reported most frequently by users of
AST-3780.
PROBLEM
AST-3780 is activated and the connection to the host has been
established. The transmit option is selected from the AST-3780
software and the modem immediately starts streaming data.
Streaming, in this context, refers to a constant request-to-send
coming from the DTE interface, while the DCE interface is
supplying a clear-to-send response, and the transmit data line is
constantly sending a stream of data.
SOLUTION
There are only six reasons for this situation to occur. Their
causes and resolutions are listed below in "most frequently the
cause" order:
I. The cable from the CC-432 card to the modem is missing
line 15 or 17, or both.
A. There is only one accurate way to assure that the lines
are there, and that is through the use of an OHM meter.
1. If an OHM meter is unavailable, make the user
remove the hoods from the cable and visually
inspect both ends.
II. The modem is not supplying transmit and receive clocks.
A. Check your modem manual to make sure that your modem
is optioned for internal clocking.
III. The CC-432 card has Jumpers 2 and 4 enabled instead of
1 and 3.
IV. There is an interrupt conflict within the PC.
A. Other BSC cards
B. Network cards
C. Third party hard disk
V. AST-3780 configuration file is selected for a different
interrupt request line than that selected on the CC-432
board.
A. i.e., software selected for IRQ-2 while the CC-432
is selected for IRQ-7.
VI. The CC-432 board is defective and needs to be returned
for repair.
A. To insure that this is the cause, run the CC-432
test supplied in the package.