IBM 3745 Problem Determination Manual page 267

Problems on One Line Only (LlC1 to LlC4)
OTR or RTS is OFF and OSR or RFS 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 LlC. Follow the procedure "Problems on All Lines of a LlC'"
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.
OTR, RTS, OSR, RFS are all ON:
Check that the cable is correctly plugged in and that the
remote control unit is ready and operationaL If they are both correct, perform a tailgate wrap test (see
Chapter 16). Then return here to analyze the results.
T~lgateWrapTe~ResuHs
- - - - - - - - - - - - - - - - - - - - - - - - - - - - ,
• Test not successful: Replace the LlC. Follow the procedure "Problems on .All Lines of a LlC"
from step 7 on page 9-5.
• Test successful, check:
Remote control unit. Perform appropriate remote control unit tests.
With the network operator the compatibility of line parameters at both ends of the line.
The programmable line speed definition.
If the problem is not fixed, go to step 11 on page 9-11.
OTR or RTS is ON and OSR or RFS is OFF:
Check that the cable is correctly plugged in. 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 LlC.
• Test successful: Go to step 11 on page 9-11.
9-16
IBM 3745 Communication Controller: Problem Determination Guide
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