IBM 3745 Problem Determination Manual page 268

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Problems on One Line Only (LlC1 to LlC4)
CCITT V.24 Switched - Modem Attachment
Note: Call-in and call-out operations are different, a call-out operation uses the autocall unit and a
call-in do.es not.
Check that the remote control unit and the modems (local and remote) are ready and operational. If
they are, perform a tailgate wrap test (see Chapter 16). Then return here to analyze the results.
Tailgate Wrap Test Results - - - - - - - - - - - - - - - - - - - - - - - - - - - . . . ,
• Test not successful:
CO
• Test successful, check:
Modem (modem tests are listed on page 9-30).
Appropriate V.25 autocall unit.
Remote control unit. Perform appropriate remote control unit tests.
With the network operator the compatibility of line parameters at both ends of the line.
If the problem is not fixed, go to step 11 on page 9-11.
The following table may help you to continue the problem determination on call-in operations. For
call-out problems, refer to: "V.25 Call-out Analysis" on page 9-20.
If on the screen, the STATUS of Perform the following ACTIONS:
the data set lead is:
10811 (Connect D.ata Set to Line) Check the system generation and line parameters (Press FS).
DTR ON If parameters OK, and RI
=
ON, check the DCE.
10812 (Data Terminal Ready) Activate the line (host side).
DTR OFF
Auto-answer line 108/1 (Connect
Incoming call:
Data Set to Line) or 10812 (Data
-
Check the transmission line.
Terminal Ready)
-
Check the DCE.
RI OFF and
-
Check the DTE-to-DCE cable connection.
DSR OFF
RTS and RFS do not flash Check data transmission (press F8).
If no data:
-
Check if the DCE is powered ON and correctly
connected.
-
Check the DTE-to-DCE cable connection.
CD OFF
-
Check the DCE.
-
Check the DTE-to-OCE cable connection.
-
Check the remote site or the system generation
parameters.
TION Significant only if DSR is ON. In this case, reset the DCE test switch to
the normal operating position.
MTON Reset test condition at the host side.
NS
Not significant
Chapter 9. L1C and Line Problems (LSS)
9-17