IBM 3745 Problem Determination Manual page 280

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Problems on One Line Only (LIC1 to LIC4)
CCITT X.21 Switched - Modem Attachment
Note: Call-in and call-out operations are different.
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:
en
• Test successful, check:
Modem (modem tests are listed on page 9-30).
Remote control unit. Perform appropriate remote control unit tests.
With the network operator:
The compatibility of line parameters at both ends of the line.
Whether the network is operational.
Whether network information is available, such as: Call progress signal (CPS) or
interface states.
If the pr~blem isnot fixed, go to step 11 on page 9-11.
If on the screen, the STATUS of Perform
th~
following ACTION$:
the data set lead is:
TOFF DTE not ready:
C OFF
-
Check the line parameters
(Pr~ss
FS).
-
If the problem persists, contact the appropriate
3745 service representative.
RON DCE not ready:
I OFF
-
Check if DCE is powered ON and correctly
connected.
-
If the problem persists, contact the public switched
network service representative.
Chapter 9. LlC and Line Problems (LSS)
9-29