IBM 3745 Series, Hardware Maintenance Reference

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5. If the cable is NTT with the connector switch set to 'operate', the test indicator
(TI) signal is not forwarded to the connected DCE, so that the received pattern
differs from the expected one.
Problem Determination Aid for LIC Type 5 and LIC Type 6
Wrap Tests Controlled from the Host
To test the DTE part of a LIC type 5 and LIC type 6, these tests are the same as
for LICs type 1 to LICs type 4. See page 4-93.
Wrap Tests Controlled from the MOSS
To test the DTE part of LICs type 5 and LICs type 6, these tests are the same as
for LICs type 1 to LICs type 4 (see page 4-94). In addtion, the following tests are
available:
Ÿ Wrap test up to DCE output (with or without line wrap block).
Ÿ Self-test (which occurs before 'control lead wrap' command takes place).
Ÿ
LIC line analysis procedures (LLAP).
See the
Advanced Operations Guide, and the Problem Determination Guide for
details.
Manual Tests Controlled from the PKD
To test the DCE part of the LIC type 5 and LIC type 6, all the following tests are
manually initiated from the PKD:
Notes:
1. The above tests run continuously until keying 'EXIT'. See the Connection and
Integration Guide for details.
2. The process of the 'status bits' from the PKD is independent from the LPDA-2.
They are:
Ÿ Alarm tone received (remote DCE power loss)
Ÿ Alarm tone received (remote DCE failure)
Ÿ Carrier loss
Manual Test Data
Disrup-
tive LIC
Type 5 LIC
Type 6
Local loop back Yes ñ * *
Remote loop back Yes
ñ
*
Local self-test Yes ñ * *
Local status No *
Remote self-test Yes *
Remote status Yes *
Digital test (transmit/receive test) Yes ñ * *
Analog test (line analysis) Yes *
LIC line analysis procedures (LLAP) Yes * *
Chapter 4. Transmission Subsystem (TSS)
4-95