CDR
396 Communication Manager Guide to ACD Call Centers
CDR
See
Call Detail Recording (CDR)
on page 394.
CDRP
Call Detail Record Poller
CDRR
Call Detail Recording and Reporting
CDRU
See
Call Detail Recording utility (CDRU)
on page 394.
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
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 message 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.
CISPR
International Special Committee on Radio Interference
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