Nortel DMS-100 Series Maintenance Manual page 63

internal loop test
The system performs each test if previous tests pass. The following
paragraphs describe the four tests.
Hardware presence test This test makes sure the formatter (6X41),
message (6X69), and timeswitch (6X44) cards are present in the LTC. This
hardware is necessary for the remainder of the tests. If one of these cards is
not present, the diagnostic returns a
generates a PM181 log report.
P-side interface presence test This test makes sure that DS-1 interface
(6X50) cards entered for the LGC/LTC are present. This test is used to set
up the next P-side loop test. The P-side interface test terminates when the
audit detects a failed 6X50 card or the user removes the failed card. The test
also terminates when the diagnostic returns a
generates a PM181 log report.
P-side loop test After the P-side interface test checks for the occurrence
of all 6X50 cards, the P-side loop test verifies the correct operation of these
and other dedicated P-side loop-around circuits for the LTC. The following
paragraphs describe the P-side interface cards that the system supports in the
LTC P-side loop test.
The LTC can be in inactive mode where one unit is inactive and the other
manual busy (ManB), system busy (SysB), or INSV. If the other unit is in
one of these states, the P-side loop test checks the 6X48 P-side loops. If the
LTC is in active mode one unit is active and the other unit is in SysB, ManB,
or INSV. When this event occurs tests run on the 6X48 and 6X50 P-side
loops. The P-side interface test also checks the LTC multiplexer.
Internal loop test This test checks the integrity of LTC speech channels.
If the LTC is out of service (OOS), a full test runs 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
P-side interface presence test (DS30A and DS-1 link interfaces)
full peripheral test
DMS-100 Family RLCM Maintenance Manual XPM12 and up
Maintenance overview 1-47
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