363-206-204
Equipment and Rear Access Cable Installation
Issue 9 October 1998
2-27
DS1 Timing Cable Installation - Rear
Access
Description
A DS1 timing cable is required if the shelf is to be externally timed. Mult Cables
are required if the timing from the shelf directly connected to the DS1 Reference
clock is to be daisy-chained to the remaining shelves in the bay. A termination
connector must be used on the output of the last shelf in a mult. (See Table 2-5.)
DS1 external timing is provided by the BBF2B TGS Circuit Pack to time a BITS
clock. When the shelf is configured to provide a sync output and the BBF2B
Circuit Packs are externally timed to a DS1 Reference a Sync Input timing cable is
required.
NOTE
:
DS1 timing cable options are listed in Table 2-5.
NOTE
:
DS1 timing connections are listed in Table 2-14.
Procedure for Connections to Timing Source
NOTE
:
The cabling from the DS1 reference clock timing source should be con-
nected to the bottom shelf in the bay. Other DDM-2000 OC-3 shelves in the
bay are daisy-chained up from the bottom shelf.
1. Obtain a DS1 timing cable Group 339, 340, or 341 (refer to Table 2-5).
2. Connect the cable to J37 of shelf 1 (bottom shelf).
3. Route the timing cable out of the DDM-2000 OC-3 bay per Figure 2-14 to
the DS1 timing reference.
4. Stack the cables as shown in Figure 2-2 or Figure 2-3.
5. Dress and tie the cables in the bay as close to the DDM-2000 OC-3 back-
plane as possible without touching any backplane pins.
6. Cut the cable to the desired length. If the bottom shelf (shelf 1) position is
unequipped, leave enough cable so the cable can reach the bottom posi-
tion when the shelf is eventually added.
7. Wire-wrap the loose end of the DS1 timing cable to the DS1 reference
clock making connections per Table 2-14.
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