IBM 3745 Problem Determination Manual page 277

Problems on One Line Only (LlC1 to LIC4)
C is OFF:
Perform a tailgate wrap test (see Chapter 16). Then return here to analyze the results.
Tailgate Wrap Test Results - - - - - - - - - - - - - - - - - - - - - - - - - - - - . . . . ,
• Test not successful: Replace the L1C. Follow the procedure "Problems on All Lines of a L1C"
from step 7 on page 9-5.
• Test successful: Check with the network operator the compatibility of line parameters at both
ends of the line.
If they are correct,. suspect the host software, otherwise, go to step 11 on page 9-11.
C is ON and I is OFF:
Check that the remote control unit and the modems 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: Replace the L1C. Follow the procedure "Problems on All Lines of a L1C"
from step 7 on page 9-5.
• Test successful, check:
Modem (modem tests are listed on page 9-30).
If the problem is not fixed, go to step 11 on page 9-11.
C and I are both ON:
Check that the remote control unit is ready and operational. If it is, perform
a tailgate wrap test (see Chapter 16). Then return here to analyze the results.
Tailgate Wrap Test Results - - - - - - - - - - - - - - - - - - - - - - - - - - - - . . . . ,
• Test not successful: Replace the L1C. Follow the procedure "Problems on All Lines of a LlC"
from step 7 on page 9-5.
• 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.
Network.
If the problem is not fixed, go to step 11 on page 9-11.
9-26
IBM 3745 Communication Controller: Problem Determination Guide
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