Glossary and Abbreviations
CDRU
See Call Detail Recording utility (CDRU).
CEM
center-stage switch (CSS)
The central interface between the processor port network and expansion port networks in a
central office (CO)
The location housing telephone switching equipment that provides local telephone service and access to toll facilities for
central office (CO) codes
The first three digits of a
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
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
4.A DS0 on a T1 or E1 facility not specifically associated with a logical
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
Class of Restriction (COR)
A feature that allows up to 64 classes of
