Nortel DMS-100 Series Maintenance Manual page 468
Subscriber carrier module-100s
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Also See for DMS-100 Series:
- Replacement procedures (1100 pages) ,
- Maintenance manual (762 pages) ,
- Manual (543 pages)
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A --4 Appendix
Each shelf in the RT can have a maximum of 24 lines installed. Since the DS-1
link has 24 DS0 timeslots, there is a one-to-one association between physical
line location and a DS0 timeslot. This association between line association and
DS0 timeslot is as follows:
Table 1 DS0 to SLC Line Circuit Translation
SLC-96 Line Circuit to DMS LEN and DS0 Timeslot Translation
Line (DMS
0
1
LEN)
DS0
0
2
Channel
SLC
1
2
Circuit
SLC Card
1
Slot
When there is no physical line card installed in the SLC-96 RT, the SLC-96 RT
sends an unequipped AB-bit pattern (A-bit = 1, B-bit = 1) to the SMS in the
DS0 timeslot associated with that line. If a line is inserted into the SLC-96,
then the appropriate AB-bit pattern is sent with the associated DS0 timeslot for
that specific line location; for a POTS line, this is usually IDLE code (A-bit =
0, B-bit = 0). The SMS makes use of this behaviour to scan each DS0 channel
for the unequipped AB-bit pattern. If it detects the unequipped AB-bit pattern
in any DS0 channel that is associated to a datafilled line in the DMS (directory
number assigned), then the SMS reports this line as unequipped to the Control
Module (CM) of the DMS. This results in the line being placed in the LMB
state. The line remains in the LMB state until the SMS detects the appropriate
IDLE AB-bit patter in the associated DS0 timeslot. Once the IDLE pattern is
received, the SMS notifies the CM that the line is now equipped, and the line
state changes to idle (IDL).
The SMS uses an internal software audit to report the unequipped line
condition. This audit runs every 15 seconds and sequences through each
possible RT on the SMS. Since each SMS can support a maximum
configuration of six RTs, it takes 90 seconds (6 x 15) for the SMS to sequence
through all the RTs. This results in a maximum delay of 90 seconds for an
unequipped/equipped line to change states in the CM from the instant that it is
removed or inserted into the RT.
OPEN WRITING XPMTLC0001SMS.AA02 2000/04/13 11:31:50
2
3
4
5
6
7
4
6
8
1
1
1
0
2
4
3
4
5
6
7
8
2
3
4
8
9
1
1
1
1
0
1
2
3
1
1
2
2
1
3
6
8
0
2
9
1
1
1
1
1
0
1
2
3
4
5
6
7
1
1
1
1
1
1
4
5
6
7
8
9
5
7
9
1
1
1
1
3
5
1
1
1
1
1
2
5
6
7
8
9
0
8
9
10
2
2
2
2
0
1
2
3
1
1
2
2
7
9
1
3
2
2
2
2
1
2
3
4
11
12
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Troubleshooting
