363-206-285 Detailed Level Procedure: DLP-543
Issue 2, February 2000 Page 1 of 4
DDM-2000 OC-3 MULTIPLEXER
Change Timing Mode on BBF2 TGS,
BBF2B/BBF2C TGS or BBF4 TG3 Circuit Pack
1.
!
CAUTION:
If shelves in a bay are connected together with timing mult cabling,
changing the timing mode on one system may affect the timing for other
systems. Ensure that proper timing arrangements are made for all
affected shelves.
NOTE:
This procedure may be used to change the timing mode on an installed
TGS/TG3 circuit pack. For example, you may want to change the timing
mode on an installed BBF2 TGS from Free Running to DS1 External, or
you may want to provision the DS1 timing output on the BBF2B/BBF2C
TGS or BBF4 TG3 to
sync out mode
. The DS1 timing output on the
BBF2B/BBF2C TGS or BBF4 TG3 can be provisioned for
sync out
mode
only when the timing mode is set to
DS1 External sync out
or
Line
Timing sync out
. See the Transmission and Synchronization Interfaces
section of this manual for a description of DS1 timing outputs.
Verify that there are no alarms or protection switches present on the system.
2. Are you changing timing mode to
DS1 External
?
If YES, then continue with Step 3.
If NO, then proceed to Step 5.
3. Check external timing references to ensure they are good.
4.
NOTE:
ED-8C724-20, G339, G340, or G341 cables are used to connect timing
references to shelf 1 in a bay. ED-8C724-20, G373 or G374 (rear
access) or ED-8C724-21, G414 and G415 (front access) cables are used
to multiple timing references to subsequent shelves in the bay (for
example, from shelf 1 to shelf 2, shelf 2 to shelf 3, etc.). The cable from
the timing reference source to shelf 1 is connected to jack J37 on the
shelf backplane (or J237 of the front access cable). The cable from shelf
1 (or lower shelf) to the next higher shelf is connected from jack J44
(P237) of the lower shelf to jack J37 (J237) of the next higher shelf.
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