AT&T 7200 series, 7500 series, 7100 series, 2500 series manual Figure B-9.External-Clock Interface

SYNCHRONIZATION OF DIGITAL FACILITIES B-17

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COMPOSITE

CLOCK

OUTPUT A

COMPOSITE

	CLOCK
COMPOSITE	CONVERTER
CLOCK
OUTPUT B NOTE 2

LOS

DETECTION

TN2131 CIRCUIT PACK

ALARMS

SYNC

OUTPUT

NOTE 1

BACKPLANE SIGNAL TO TMS OR MODULE CONTROL CLOCK

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.

Figure B-9.External-Clock Interface

				PORT
				CARRIERS
NCTE				DSI
				INTERFACE
	CLOCK A1
		TN2131	MODULE	SWITCHING
REFERENCE			CLOCK	NETWORK
		0	OR	0
1
			TMS CLOCK
			0
	STRATUM	CLOCK B1
	3
	EXTERNAL	CLOCK A2
	CLOCK
			MODULE
			CLOCK
REFERENCE		TN2131	OR	SWITCHING
2			TMS CLOCK	NETWORK
		1
			1	1
	CLOCK B2			DSI
NCTE
				INTERFACE

Figure B-10.External-Clock Duplicated Synchronization