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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Glossary and Abbreviations
GL-2
C
CBR
Constant bit rate—Digital information, such as video and digitized voice, that is represented by a
continuous stream of bits. CBR traffic requires guaranteed throughput rates and service levels.
CES
Circuit Emulation Service—a connection over an ATM PVC-based network that provides
end-to-end service, sometimes called virtual trunking. Conforms to CES ATM Forum VTOA-78
Interoperability Specifications (CES-IS).
CDV
Cell delay variation, which measures the allowable variance in delay between one cell and the
next, expressed in fractions of a second. When emulating a circuit, CDV measurements allow the
network to determine if cells are arriving too fast or too slow.
CMC
Compact Modular Cabinet
CSCC
Compact Single Carrier Cabinet
CSS
Center Stage Switch—the central interface between the processor port network (PPN) and the
expansion port networks (EPN).
CSU
Channel service unit
D
DCS
Distributed Communication System
DS1
Digital Signal, Level 1—The 1.544 Mbps digital signal format defined for operation in the
international digital hierarchy.
DSU
Data service unit
DTE
Data terminal equipment
E
EI
Expansion interface
EPN
Expansion port network