ZTN78, ZTN79, ZTN76, ZTN77, Did

Table 2-B. Circuit Packs, Their Functions, and Protectors

Approved Secondary	Circuit Pack	Function
Wiring Protector

N/A	ZTN78	Supports single-line voice terminals.
		(Must not be used on out-of-building
		circuits, )

SCP-1 or 79A	TN742	Supports off-premises, out-of-
		building, and bridged single-line
		voice terminals.

lTW/LlNX343* I ROB	ZTN79	Supports the 7300H Series voice
		terminals used with a MERLIN®
		system. (Requires local (set) power
		for distances beyond 1000 feet.)

ITWILINX343* lROB	TN735	Supports MET sets.
N/A	TN726	Supports data terminals and
		computers.
N/A	TN758	Contains pooled modems.
SCP-1 , SCP-2, SCP-3,	ZTN76	Supports ground start trunks.
or LP5-230-220
SCP-1 , SCP-2, SCP-3,	ZTN77	Supports bop start trunks.
or LP5-230-220
SCP-1 or 79A	TN753	Supports direct inward dialing trunks.
		(DID)
SCP 1 or 79A	TN760B	Supports tie trunks.
N/A	TN763	Supports auxiliary equipment.
N/A	ZTN130 (R3)	Call processing/memory.
N/A	TN748B	Tone Detector.
SCP-1 or 79A	TN767	Provides DS1 Interface.
N/A	ZTN131 (R3)	Provides system clocks, tone
		generators, detectors, and DS1
		synchronization.
SCP-1 or 79A	TN747E3	Supports ground start or loop start
		trunks.
lTW/LlNX343* I ROB	TN762B	Supports hybrid voice terminals.
		Must be vintage 4 or later.

*Note: lROB unit ITW341 has been replaced. Use model lTW/LlNX343 only.

2-24	November 1995

ADTRAN 25 manual ZTN78, ZTN79, ZTN76, ZTN77, Did