Nortel Networks NN43021-110 User Manual

Page 68

List of terms

loop

A bidirectional path between network equipment and peripheral equipment.

module power supplies

Individual power units that generate the different DC voltages required by
the cards installed in each module.

Network Equipment

A hardware subsystem that provides digital multiplexed switching for voice,
data, and signaling paths.

office data

Office data represents system configuration data, peripheral equipment
data, and transient data (temporary) used for call processing.

PCM

Pulse Code Modulation.

pedestal

The bottom element in a column. Each pedestal houses a blower unit, an
air filter, the PDU (which contains the column circuit breakers), and the
system monitor.

power distribution unit (PDU)

Input power for CS 1000M Large System and Meridian 1 Large System are
brought into the pedestal to the PDU. The PDU distributes input power to
the column.

Pulse Code Modulation (PCM)

A modulation technique where the signal is converted from an analog to a
digital format by sampling the signal at periodic intervals and digitizing the
amplitude into a finite number of discrete levels

random-access memory (RAM)

A storage system or computer memory accessible by the user for either
storing or retrieving information. RAM is volatile memory.

read-only memory (ROM)

Storage system or computer memory that is "burned into" the
microprocessor chip and can be read, but not written to or modified. ROM is
nonvolatile memory.

redundancy

The duplication of software, or hardware, or both (such as redundant CPUs)
used as a standby in case one fails.

Nortel Communication Server 1000

Communication Server 1000M and Meridian 1 Large System Overview

NN43021-110

01.03

Standard

Release 5.0

18 February 2008