Instruction manual

HARDWARE DESCRIPTION
Optional Circuit Packs
The following CPS are optional and can be mounted in any slot not occupied by the required CPS.
Station Port Circuit Packs
● TN726 Data Line
Provides eight ports for Asynchronous Data Units (ADUs). Used for in-building service
within 2000 feet of the system cabinets. Data speeds from 300 bps to 19.2 Kbps are
supported. Service beyond 2000 feet at less than 19.2 Kbps is supported; see Section 5
“Technical Specifications.”
Extends a serial communications link from the system to data
equipment over standard station wiring.
● TN735 MET Line
Provides four ports for Multibutton Electronic Telephone (MET) sets. Used for in-building
service within 1000 feet of the system cabinets.
● TN742/TN746 Analog Line
Provides eight ports (16 ports for TN746) for single-line voice terminals with or without non-
neon message waiting lamps. Also supports Off Premises Stations (OPS) and out-of-
building service. Auxiliary equipment interfaces are also supported. Used for service within
24,000 feet of the system cabinets. Five voice terminals can be bridged onto each port.
Only two terminals can be off-hook simultaneously on each port; otherwise, transmission
can be degraded.
Note: The Off-Premises Stations
● ZTN78 Tip Ring Line
Provides eight ports for single-line sets
Used for in-building nonbridged voice
cabinets.
Note: Equipment connected for
following requirements:
— AC impedance: 600 ohms
must be FCC registered.
with or without non-neon message waiting lamps.
terminal service within 2000 feet of the system
ZTN78 Tip Ring Line CP port must meet the
— DC current: Less than 30 ma at 48 volts
— Ringer Equivalence Number (REN): Less than 1.15 (set plus adjuncts).
The ZTN78 CP ports can also be used for interface with the AT&T VOICE
Message System (VMS).
● ZTN79 ATL Line
POWER Voice
November 1995
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