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Issue 1

April 2000

Glossary and Abbreviations 

GL-2

 

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.

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).

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.

Compact Modular Cabinet

Compact Single Carrier Cabinet

Center Stage Switch—the central interface between the processor port network (PPN) and the 
expansion port networks (EPN).

Channel service unit

Distributed Communication System

Digital Signal, Level 1—The 1.544 Mbps digital signal format defined for operation in the 
international digital hierarchy.

Data service unit

Data terminal equipment

Expansion interface

Expansion port network