Instruction manual

Control Unit
Table 3–1. Line/Trunk and Extension Modules
Module
Line/
Trunk Description
008 none Capacity: 8 analog extension jacks
Supports: Analog multiline telephones; Call Management System (CMS)
008 MLX none Capacity: 8 digital extension jacks, each with 1 or 2 extensions (each
extension is assigned an individual extension number)
Supports: MLX extensions, including:
— MLX voice only
— MLX voice with Voice Announce to Busy
— MLX voice and ISDN terminal adapter
— MLX voice and Multi-Function Module (MFM) with T/R adjunct
— ISDN terminal adapter only
008 OPT
*
none Capacity: 8 T/R extensions on 2-way voice transmission path with support
for telephones with message-waiting lights, 2 TTRs
Supports: On-premises or off-premises single-line telephones
012 none Capacity: 12 T/R extensions on 2-way voice transmission path with
support for telephones with message-waiting lights, 2 TTRs
Supports: Single-line telephones; AT&T Attendant; MERLIN MAIL

Voice
Messaging System; CONVERSANT

; T/R adjuncts (such as answering or
fax machine); analog data devices (such as modems)
016
†
none Capacity: 16 T/R extensions on 2-way voice transmission path with
support for telephones with message-waiting lights, 4 TTRs
Supports: Single-line telephones; AT&T Attendant; MERLIN MAIL

Voice
Messaging System; CONVERSANT

; T/R adjuncts (such as answering or
fax machine); analog data devices (such as modems).
100D T1 or PRI Capacity: 24 channels/B-channels (“virtual”
lines/trunks) for voice and
analog data or for digital data only (T1); or 23 for voice and data and 1
channel used for signaling (PRI).
Supports: See section “100D Module” for details. T1 emulates 24
lines/trunks: loop-start, ground-start, tie, and Direct Inward Dial (DID;
Hybrid/PBX mode only); can also supply AT&T subscriber services. In
Release 4.0 and later, T1 can also provide high-speed data
communications and digitally emulated tie trunks for data
communications. PRI supports AT&T subscriber services and allows high-
speed digital data communications and includes special features.
*
The system software recognizes the OPT module as a 012 module. Even though the OPT
module only has 8 jacks, it uses 12 ports of capacity, thereby decreasing overall
extension capacity by 4 extensions for every OPT module.
† This module is not compatible with releases prior to Release 4.0.
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3–6 System Components