IBM 3745 Problem Determination Manual page 270

o
o
o
o
o
Problems on One Line Only (LIC1 to LlC4)
PWI and CRQ are both ON
• Check that the remote control unit, the modems (local and remote), and the autocall unit (ACU) are
ready and operational.
• Perform a tailgate wrap test (see Chapter 16). Then return here to analyze the results.
• See the note on the next page.
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).
Remote control unit. Perform appropriate remote control unit tests.
Autocall unit. Perform appropriate ACU 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.
PWI is
ON
and CRQ is
OFF
• Perform a tailgate wrap test (see Chapter 16). Then return here to analyze the results.
• See the note on the next page.
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.
PWI and CRQ are both OFF
• Check that the autocall unit (ACU) is ready and operational.
• Check if the line is activated.
• Check if the cables are correctly plugged in.
• Perform a tailgate wrap test (see Chapter 16). Then return here to analyze the results.
• See the note on the next page.
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:
The autocall initialization
If the problem is not fixed, go to step 11 on page 9-11.
Chapter 9. LIe and Line Problems (LSS)
9-19