Station Tests - Nortel DMS-100 Series Maintenance Manual

10-10 Trouble isolation and correction
The ALT in a DMS-100 switch office occurs under the LNS subsystem. The
previous figure shows the commands available at the ALT level of the LNS
level, which define the ALT. A description of these commands follows:
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The CKTTST uses the following to apply to loops:
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The CKTTST performs circuit tests to confirm the ability of the set or line card
to transmit and receive messages correctly. The CKTTST performs circuit
tests to confirm the ability of the set or line card to adhere to message protocol.
When the user posts the failures at the LTP, the switch operator receives the
lines that fail to meet standards of quality. Lines are also identified by output
reports the ALT log subsystem generates. The user manually tests and corrects
the identified failures.

Station tests

Station tests occur under the LNS subsystem at a MAP terminal. For Silent
Switchman (SSMAN) and Station Ringer (SR) tests, station tests occur from a
station. Tests for stations are manual tests.
Station test results appear at the visual display unit (VDU), except for the
Station Ringer and Silent Switchman tests. The station receives the results of
these tests.
297-8361-550 Standard 04.01 September 2000
The DIAGN command executes a full diagnostic test on the line card
circuits. The DIAGN command identifies defective line cards before the
defective line cards generate customer reports. The DIAGN command
uses the line test unit (LTU) of the OPM RMM to start tests. If the LTU is
not present, this command starts the no-LTU diagnostic.
The SDIAG command is a subset of the DIAG test. The SDIAG command
makes sure that most of the line card circuitry operates correctly.
The BAL command automatically sets the balance network in the line card
to provide transmission balance. The transmission balance occurs between
the four-wire side of the switch and the two-wire loop. The condition
minimized subscriber reports of noise, echo, and garbled speech.
The LIT command starts an automatic test that detects cable pair faults.
These faults must be cleared before the faults affect service and subscribers
report problems like hum, noise, grounds, or false ring trip.
Meridian business sets (MBS)
data units (DU) that associate with Datapath
asynchronous interface modules (AIM)
IBERT line cards