2-28 Issue 9 October 1998
363-206-204
Equipment and Rear Access Cable Installation
Procedure for Intershelf Timing Connections
NOTE
:
This procedure should be performed to daisy-chain the timing from the
shelf that is directly connected to the DS1 reference clock to the remaining
shelves in the bay. For DS1 timing to be delivered to all shelves in the bay,
DS1 timing cable mults from shelf to shelf must be daisy-chained up from
the bottom shelf. No shelf should be skipped.
1. Obtain a DS1 timing cable listed in Group 373 or 374 (Table 2-5).
2. Connect the cable to J37 of the shelf.
3. Route the cable to the side of the bay and down and connect it to J44 of the
shelf below as shown in Figure 2-14.
4. Dress and tie the cables in the bay as close to the backplane as possible
without touching any backplane pins.
5. Repeat Steps 1 through 4 for each shelf in the bay (as required).
Procedure for Connections to Provide
External Timing to BITS Clock
NOTE
:
The Group 394 cable is used when the shelf is configured to provide sync
output for the BITS clock and when the BBF2B circuit packs are externally
timed from a DS1 reference out of a BITS clock. The Group 394 cable
should not be used when the shelf is configured for DS1 MULT output oper-
ation or when the BBF2B circuit packs are loop timed.
NOTE
:
The Group 394 Cable is installed in series with the incoming external refer-
ence signal on P37 of the OC-3.
1. Obtain two DS1 timing cables Group 339, 340 or 341 and a Group 394
Sync Output Cable (Table 2-5). Refer to Figure 2-18.
2. Connect the Group 394 to J37.
3. Connect Group 394 connector J237 to Group 339, 340 or 341 connector
P237.
4. Route the timing cables out of the DDM-2000 OC-3 bay per Figure 2-14 to
the DS1 timing reference output.
5. Connect Group 339, 340 or 341 to connector J44.
6. Route the timing cables out of the DDM-2000 OC-3 bay per Figure 2-14 to
the DS1 timing reference input.
Summary of Contents for DDM-2000 OC-3
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