Figure B-9. External-Clock Interface; Figure B-10. External-Clock Duplicated Synchronization - AT&T DEFINITY 2500 series Network Manual

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COMPOSITE
CLOCK
OUTPUT A
COMPOSITE
CLOCK
CONVERTER
COMPOSITE
CLOCK
OUTPUT B
NOTE 2
NOTES:
1. Alarm signals are cabled to the cross-connect field. For System 85 and Generic 2, they are then cross-connected and
cabled back to the TN442C or external alarm interface. They use the same cable the composite clock signals come in on.
2. System 85 and Generic 2 applications require that the composite clock synchronization signal be connected from the
skin of the cabinet to the module control or TMS carrier via an intercarrier cable. TMS and module control carriers
(for both System 85 and Generic 2) use the H-600-260 group 1 cable, while Generic 2 universal module control
carriers use the H-600-271 group 1 cable.
NCTE
CLOCK A1
REFERENCE
1
STRATUM
3
EXTERNAL
CLOCK
REFERENCE
2
CLOCK B2
NCTE
LOS
DETECTION

Figure B-9. External-Clock Interface

TN2131
0
CLOCK B1
CLOCK A2
TN2131
1

Figure B-10. External-Clock Duplicated Synchronization

SYNCHRONIZATION OF DIGITAL FACILITIES
TN2131 CIRCUIT PACK
ALARMS
SYNC
OUTPUT
MODULE
SWITCHING
CLOCK
NETWORK
OR
0
TMS CLOCK
0
MODULE
CLOCK
OR
SWITCHING
TMS CLOCK
NETWORK
1
1
B-17
NOTE 1
BACKPLANE SIGNAL
TO TMS OR MODULE
CONTROL CLOCK
PORT
CARRIERS
DSI
INTERFACE
DSI
INTERFACE