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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Glossary and abbreviations
1623
CDRR
Call Detail Recording and Reporting
CDRU
See Call Detail Recording utility (CDRU).
CED
Caller entered digits
CEM
Channel-expansion multiplexing
center-stage switch (CSS)
The central interface between the processor port network and expansion port networks in a CSS-connected
system.
central office (CO)
The location housing telephone switching equipment that provides local telephone service and access to toll
facilities for long-distance calling.
central office (CO) codes
The first three digits of a 7-digit public-network telephone number in the United States.
central office (CO) trunk
A telecommunications channel that provides access from the system to the public network through the local
CO.
CEPT1
European Conference of Postal and Telecommunications Rate 1
CESID
Caller’s Emergency Service Identification
channel
1. A circuit-switched call.
2. A communications path for transmitting voice and data.
3. In wideband, all of the time slots (contiguous or noncontiguous) necessary to support a call. Example: an
H0-channel uses six 64-kbps time slots.
4. A DS0 on a T1 or E1 facility not specifically associated with a logical circuit-switched call; analogous to a
single trunk.
channel negotiation
The process by which the channel offered in the Channel Identification Information Element (CIIE) in the
SETUP message is negotiated to be another channel acceptable to the switch that receives the SETUP mes-
sage and ultimately to the switch that sent the SETUP. Negotiation is attempted only if the CIIE is encoded as
Preferred. Channel negotiation is not attempted for wideband calls.
CI
Clock input
circuit
1. An arrangement of electrical elements through which electric current flows.
2. A channel or transmission path between two or more points.
circuit pack
A card on which electrical circuits are printed, and IC chips and electrical components are installed. A circuit
pack is installed in a switch carrier.