Instruction manual

Glossary
module
Circuit pack in the control unit that provides the physical
jacks for connection of telephones and/or outside trunks to
the communications system. In the name of a module, the
first digit indicates the number of
line/trunk jacks it
contains; the last digit indicates the number of
extension
jacks
it contains. If no letters appear after the number, a
line/trunk module provides
loop-start trunks or an
extension jack module provides analog or
tip/ring jacks.
For example, a 408 GS/LS MLX module contains four
line/trunk jacks and eight digital (MLX) extension jacks,
and provides either
loop-start (LS) or ground-start
(GS) trunks.
Multi-Function
Module
See
MFM .
multiline telephone
An analog or digital (MLX) telephone that provides multiple
line buttons for making or receiving calls or programming
features.
multiplexing
The division of a transmission channel into two or more
independent channels, either by splitting the frequency
band into a number of narrower bands or by dividing the
channel into successive time slots.
Music On Hold
Customer-provided music source or Magic on Hold
connected to the system through a
loop-start jack.
N
network
Configuration of communications devices and software
connected for information interchange.
network interface
Hardware, software, or both that links two systems in an
interconnected group of systems, for example, between
the local telephone company and a PBX.
NI-1 BRI
(National Integrated Services Digital Network 1 Basic Rate
Interface) A type of digital facility that carries the
equivalent of three lines. Two are called
B-channels and
provide voice and data communications services. A third
D-channel controls signaling and maintains operations on
the B-channels.
System Manager's Guide
GL–15