Nortel DMS-100 Series Maintenance Manual page 624

10-6 Trouble isolation and correction
P-side interface presence test
This test makes sure that DS-1 interface (6X50) cards entered for the LGC
or LTC continue to be present. This test is used to prepare the following
P-side loop test.
The P-side interface test ends when a 6X50 card is detected or removed. At
this time, the diagnostic returns a
produces a PM181 log report.
P-side loop test
The P-side interface test checks for the presence of all 6X50 cards. The
P-side loop test checks the correct operation of these 6X50 cards. The
P-side interface test checks for the presence of other dedicated P-side
loop-around circuits for the LTC. The P-side interface cards supported in
the LTC are as follows.
When the LTC is in inactive mode, the P-side loop test checks only 6X48
P-side loops. The inactive mode is when one unit is inactive and the other is
manual busy (ManB), system busy (SysB) or InSv.
When the LTC is in active mode, the system tests both 6X48 and 6X50
P-side loops. The active mode is when one unit is active and the other unit
is in SysB, ManB or InSv. The P-side interface test also checks the LTC
multiplexer.
Internal loop test
This test checks the integrity of LTC speech channels. When the LTC is out
of service (OOS), the system runs a full test on every channel.
If the LTC is InSv, the test checks two speech channels selected at random.
The internal loop test also checks the operation of LTC PCM enable/disable
gates.
LTC P-side link diagnostic
The P-side link diagnostic consists of three separate tests:
Hardware presence test
This test checks for the message (6X69) and timeswitch (6X44) cards in the
LTC or LGC. These cards are necessary for the other P-side link diagnostic
tests to run.
297-8211-550 Standard 05.01 August 1999
hardware presence test
P-side interface presence test (DS30A and DS-1 link interfaces)
full peripheral test
error. The diagnostic
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