ADTRAN 25 manual Starlan ZTN84

MAINTENANCE
	Table 4-C.	Circuit Pack Voltage–Symptoms
	Voltage/		+5 volts		-5 volts		-48 Volts
	Circuit Pack (Notes)		No+5 V		No-5 V		No-48 V
	Call Proc. (ZTN82,	x	System Failure	x	EIA Failure	x	ETU Activated
	ZTN1 28) for RI
	Memory (ZTN81,	x	System Failure	-	-	-	-
	ZTN1 27) for RI
	CPU/Memory (ZTN129,	x	System Failure	x	EIA Failure	x	ETU Activated
	for R2, ZTN130
	for R3)
	STARLAN (ZTN84)	x	CP Failure	x	CP Failure	-	-
	Service Ckt (ZTN85	x	System Failure	-	-	-	-
	or ZTN131 (R3)
	Hybrid Line (ZTN79)	x	CP Failure	x	No Voice	x	Station OS
	Tip/Ring (ZTN78)	x	CP Failure	x	No Voice	x	Station OS
	Analog Line (TN742)	x	CP Failure	x	No Voice	x	Station OS
	MET Line (TN735)	x	CP Failure	x	No Voice	x	Station OS
	Loop Start (ZTN77)	x	CP Failure	x	No Voice	x	Trunks OS
	Grd Start (ZTN76)	x	CP Failure	x	No Voice	x	Trunks OS
	DID Trk (TN753)	x	CP Failure	x	No Voice	x	Trunks OS
	Tie Trk (TN760B)	x	CP Failure	x	No Voice	x	Trunks OS
	Aux Trk (TN763)	x	CP Failure	x	No Voice	x	AUX. Eq. OS
	Data Line (TN726)	x	CP Failure	-	-	-	-
	Tone Det (TN748)	x	Tone Failure	-	-	-	-

Legend: CP—Circuit Pack ETU—Emergency Transfer Unit OS-Out-of-Service

X—indicates that the voltage is used by the associated CP.

Notes: 1 .Ringing voltage (not shown on table) is used by the ZTN78 and TN742 CPs. Associated stations will not ring if a ringing voltage problem occurs.

2.TN746B same as TN742

3.TN747 same as ZTN76 and ZTN77

4.TN762 same as ZTN79.

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