3-16
Issue 9 October 1998
363-206-204
Equipment and Front Access Cable Installation
telemetry system. Connection of parallel telemetry requires a parallel telemetry
system in the office, thus parallel telemetry is only used in a central office
environment.
There are two options for cabling parallel telemetry:
â–
Cable directly to telemetry equipment
â–
Cable to another shelf.
Unless otherwise specified, Shelf 1, the bottom shelf in the bay, should be cabled
directly to the office parallel telemetry per the following procedure.
Additional shelves in the bay are daisy-chained up from Shelf 1. The shelf
identification (SID) number for the parallel telemetry is determined by backplane
wiring and the wiring assignments within the mult cable. If shelf positions in a bay
are skipped, SID numbers for shelves above the empty position will not match the
shelf positions in the bay.
Parallel telemetry cable options are listed in Table 3-4. Parallel telemetry
connections are listed in Table 3-7.
Procedure for Connections to Office Alarms
Perform this procedure for shelf 1, which will be directly connected to the
telemetry system.
1. Obtain a parallel telemetry cable Group 437 or 438 (refer to Table 3-4).
2. Connect the cable to P254 of the front access cable, which is already con-
nected to Shelf 1.
3. Route the parallel telemetry cable out of the DDM-2000 OC-3 bay to the
telemetry system, stacking the cable as shown in Figure 3-2.
4. Cut the parallel telemetry cable to the desired length at the telemetry panel.
5. Wire-wrap the loose end of the parallel telemetry cable to the telemetry
system, making connections as shown in Table 3-7.
6. Dress and secure the cable in the bay.
Procedure for Other Shelves
Perform the following procedure for multing the other shelves to shelf 1. The cable
added in this procedure is to mult parallel telemetry from other shelves in a bay to
shelf 1. In this procedure, shelf 1 will be connected to shelf 2; shelf 2 will be
connected to shelf 3; etc.
For parallel telemetry in a shelf other than shelf 1 to be reported, all parallel
telemetry cable mults between that shelf and shelf 1 must be in place. Do not skip
any shelves.
1. Connect the parallel telemetry cable (G421, P254) of each shelf to the par-
allel telemetry cable (G422, J254) of the shelf below it.
To Next Page
Loading...
Need help?
General
