COR

Glossary

COR

See Class of Restriction (COR).

COS

See Class of Service (COS).

CP

Circuit pack.

CSN

See circuit-switched network.

CSU

Channel service unit.

cyclic redundancy checking (CRC)

D

A method for detecting read, transmit, and write errors in data. At the transmission end, the system treats a block of data as a single binary number, divides it by some specified binary number, and appends the remainder (called the CRC character) to the data. At the receiving end, the system recalculates the remainder and compares the result to the CRC character. If the two agree, there are no errors.

data channel

A communications path between two points used to transmit digital signals.

data-communications equipment (DCE)

The equipment (usually a modem, data module, or packet assembler/disassembler) on the network side of a communications link that makes the binary serial data from the source or transmitter compatible with the communications channel.

datagram

In packet switching, a packet that carries information sufficient for routing from the originating data terminal equipment (DTE) without the necessity of establishing a connection between the DTEs and the network. Connectionless, unreliable.

data link

The configuration of physical facilities enabling end terminals to communicate directly with each other.

Administration for Network Connectivity

 

 

555-233-504 — Issue 1 — April 2000

CID: 77730

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Lucent Technologies Release 8.2 manual Cor, Cos, Csn, Csu