Nortel DMS-100 Series Maintenance Manual page 395

9 The channel loss test uses the TTU.
10 The noise test uses the TTU.
11 The SMS sends the RCS a message to terminate the channel test and
sends idle A-B bits.
12 The diagnostic is complete.
Multi-party test sequence
The test sequence for a multi-party card follows:
1 The SMS sends the RCS a channel test setup request.
2 The RCS connects the absorb-PTPG termination.
3 The SMS sends idle A-B bits and scans for off-hook. The RCS detects
the absorb termination as off-hook and sends the SMS an off-hook
pattern. This pattern consists of A- and B-bits.
4 The echo return loss test uses the TTU.
5 The SMS sends the RCS an on-hook message to remove termination,
idle A-B bits, and scan for an on-hook condition.
6 The RCS detects termination removal as on-hook and sends the SMS an
on-hook A- and B-bit pattern.
7 The SMS signals the RCS to test ringing. The RCS connects the reflect
termination. The RCS detects termination as off-hook, if ringing and
signals off-hook to the SMS.
8 The loss test uses the TTU.
9 The noise test uses the TTU.
10 The SMS sends the RCS a message to remove termination.
11 The SMS signals the RCS to test –T party. The RCS connects the
reflect-NTPG termination. The RCS detects termination if the –T
ringing and signals tip party ground to the SMS.
12 The channel loss test uses the TTU to determine if reflect termination
made.
13 The SMS requests ANI test that must indicate tip ground. The RCS
signals tip party ground. The SMS sends A-B bits for reflect
termination.
14 The SMS sends the RCS a message to remove termination.
15 The SMS signals the RCS to test +R ringing. The RCS connects absorb
termination, detects the termination as off-hook if +R ringing occurs, and
signals off-hook to the SMS.
16 The echo return loss test uses TTU to determine if absorb termination
made.
DMS-100 Family SMS Maintenance Manual XPM10 and up
Trouble isolation and correction 9-31