DLP-543: Detailed Level Procedure 363-206-285
Page 2 of 4 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
NOTE:
If BBF2B/BBF2C TGS or BBF4 TG3 circuit packs are installed and the
timing mode is set to DS1 External sync out mode, an ED-8C724-20,
G394 cable must be connected to jack J37 on the shelf backplane (or
J237 of the front access cable). This cable has a relay to disconnect the
external timing supply if the BBF2B/BBF2C TGS or BBF4 TG3 circuit
pack is removed.
Make DS1 external timing reference connections as shown in Table A.
5. Make synchronization DS1 timing output connections as shown in Table B, if
required.
6.
!
CAUTION:
A momentary transmission hit will occur whenever the
TGS/TG3
circuit
pack is switched.
Is a CIT available?
If YES, then continue with Step 7.
If NO, then proceed to Step 8.
7. Use the switch-sync:s=circuitpack,pri=manual command to switch
timing to TIMING slot 2, if not already active.
Response: ACTIVE LED lights on TGS/TG3 circuit pack in TIMING
slot 2.
8. If Sync Autoreconfiguration has been enabled (rtrv-sync) on a line-timed
shelf and you are changing timing to DS1 External or Free Running, use the
(set-sync) command to disable Sync Autoreconfiguration.
Table A – DS1 Timing Reference Source Connections
Name Desig. Conn. Term. Color
Receive from Primary DS1 Reference
T
R
P37
6
1
BK
O
Receive from Secondary DS1 Reference
T
R
7
2
R
G
Table B – DS1 Timing Output Connections
Name Desig. Conn. Term. Color
Transmit Primary DS1 Reference
T
R
P44
6
1
BK
O
Transmit Secondary DS1 Reference
T
R
7
2
R
G
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