INSTALLATION
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