IBM 3745 Problem Determination Manual page 281

Problems on One Line Only (LIC1 to LIC4)
Modem and Link Tests
Check that you do not have a line configuration problem, see page 9-1.
If available, perform the following tests:
1. Stand-alone modem tests, described in the modem documentation:
• Local modem self-test
• Remote modem self-test
• Modem line test (end-to-end).
2. Link level 2 test from the host
Use the VT AM 'MODIFY LL2' command or the NetView 'LL2' command (on a non-switched SOLC
link) to test the link between the two NCPs.
Refer to VTAM Operation or NetView Operation documentations for detailed informatton.
3. Local modem loopback test (loop 3)
Refer to the MOSS WTT function in the
3745
Advanced Operations Guide.
3745
Local Modem
Remote Modem
-
LlC
'-
DTE
,
I
Line
~
"
' - - -
4. Remote modem loopback test (loop 2):
Refer to the MOSS WT~ function in the
3745
Advanced Operations Guide.
3745
Local Modem
Remote Modem
r - - - '
LlC
'"
DTE
,
I
Line
~
"
' - - -
5. If a test result leads you to replace a LlC, refer to the
3745
Connection and Integration Guide.
9-30
IBM 3745 Communication Controller: Problem Determination Guide
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