Glossary C
Centillion 1200N ATM Switch User Manual B-15
NTP 297-8103-903
CDVT
Cell Delay Variation Tolerance-ATM layer functions may alter the traffic
characteristics of ATM connections by introducing Cell Delay Variation. When
cells from two or more ATM connections are multiplexed, cells of a given ATM
connection may be delayed while cells of another ATM connection are being
inserted at the output of the multiplexer. Similarly , some cells may be delayed while
physical layer overhead or OAM cells are inserted. Consequently, some
randomness may affect the inter-arrival time between consecutive cells of a
connection as monitored at the UNI. The upper bound on the "clumping" measure
is the CDVT.
CE
Connection endpoint: A terminator at one end of a layer connection within a SAP.
CEI
Connection endpoint Identifier: Identifier of a CE that can be used to identify the
connection at a SAP.
Cell
A unit of transmission in ATM. A fixed-size frame consisting of a 5-octet header
and a 48-octet payload.
Cell Header
ATM Layer protocol control information.
CER
Cell Error Ratio: The ratio of errored c ells in a transmission in relation to th e total
cells sent in a transmission. The measurement is taken over a time interval and is
desirable to be measured on an in-service circuit.
CES
Circuit Emulation Service: The ATM Forum circuit emulation service
interoperability specification specifies interoperability agreements for supporting
Constant Bit Rate (CBR) traffic over ATM networks that comply with the other
ATM Forum interoperability agreements. Specifically, this specification supports
emulation of existing TDM circuits over ATM networks.
CFAD
Cell Frame Assembly/Disassembly