Nortel DMS-100 Series Maintenance Manual page 104

4-4 Star Remote System automatic maintenance
Each test starts when all previous tests have passed. The following paragraphs
describe these four tests.
Hardware presence test This test checks for the presence of formatted
(NT6X41), message (NTMX76AB), and timeswitch (NT6X44) cards in the
LTC. This hardware is necessary for the remainder of the tests. If any one of
these cards is not present, the diagnostic program returns a No Resources
error message and produces a PM181 log report.
P-side interface presence test This test checks that DS-1 interface (NT6X50)
cards, entered in table LTCINV for the LTC, are present. This test prepares for
the P-side loop test. The P-side interface test terminates when a failed
NT6X50 card is detected or the NT6X50 is removed. The diagnostic program
returns a No Resources error and produces a PM181 log report.
P-side loop test After the P-side interface test checks for the presence of all
NT6X50 cards, the P-side loop test checks the correct operation of these and
other dedicated P-side loop-around circuits for the LTC.
If the LTC is in inactive mode, the P-side loop test checks only NT6X48 P-side
loops. In the inactive mode, one unit is inactive and the other manual busy
(ManB), SysB, or in-service (InSv)
If the LTC is in active mode, both NT6X48 and NT6X50 P-side loops are
tested. In the active mode, one unit is active and the other is SysB, ManB, or
InSv. The P-side interface test also checks the LTC multiplexer.
Internal loop test This test checks the data integrity of LTC speech channels.
If the LTC is OOS, a full test on every channel is run. If the LTC is InSv, the
test checks two speech channels selected at random. The internal loop test also
checks the operation of LTC pulse-code modulation (PCM) enable/disable
gates.
LTC P-side link diagnostic program
The P-side link diagnostic program includes three separate tests:
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•
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Hardware presence test This test checks for the message (NTMX76AB) and
timeswitch (NT6X44) cards in the LTC. These cards are necessary for the
other P-side link diagnostic tests to run. If any of these cards are not present,
the diagnostic program returns a No Resources error message and
produces a PM181 log report.
297-8353-550 Standard 05.01 March 2001
hardware presence
P-side interface presence (DS-1 link interfaces)
full peripheral