Nortel DMS-100 Series Maintenance Manual page 394

9-30 Trouble isolation and correction
To remove a termination, the SMS sends an on-hook message to the RCS in
the M-field of the DDL.
The following sequence of events occurs during test setup of an RCS line
card:
1 The CM sends a test request to the SMS.
2 To initiate test setup in the RCS, the SMS sends an A- and B-bit pattern
3 Within 100 ms, the RCS returns a seize RC message to the SMS in the
4 To respond, the SMS sends a proceed RC message to the RCS in the
5 Within 800 ms, the RCS returns a proceed RC message to the SMS using
After test setup, the SMS sends the RCS exact A- and B-bit patterns to select
correct test terminations for specified tests. The test sequences for
single-party, multi-party, and coin cards, appear in the following examples.
Single-party test sequence
The test sequence for a single-party card follows:
1 The SMS sends the RCS channel test setup request sequence.
2 The RCS connects the absorb-PTPG termination.
3 The SMS sends idle A-B bits and scans for an off-hook message. The
4 The echo return loss test uses the transmission test unit (TTU).
5 The SMS sends the RCS an on-hook message to remove termination,
6 The SMS sends an on-hook message to the RCS to remove termination.
7 The RCS detects termination removal as on-hook and sends the SMS an
8 The SMS requests a single-party ringing test and scans for off-hook.
297-8231-550 Standard 09.01 August 1998
to the RCS. The bit pattern name is the per-channel signaling bit test
pattern or channel test pattern.
M-field of the DDL. This message indicates that RCS hardware needed
to set up a test configuration functions correctly.
M-field of the DDL.
the M-field of the DDL. This message indicates that a metal test pair
connected to the subscriber loop. The message indicates that an
absorb-PTPG termination was set up to the associated line circuit in the
line card.
RCS detects the absorb termination as off-hook and sends the SMS an
off-hook pattern of A-B bits.
sends idle A-B bits, and scans for on-hook.
on-hook A-B pattern.
The RCS connects the reflect termination. The RCS detects the
termination as off-hook, if ringing, and signals off-hook to the SMS.