AT&T System 25 - Manual (Page 48)

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