Glossary
GL-4 Issue 3 June 2000
CD-ROM
Compact Disk, Read Only Memory
CDTU
Channel and Drop Test Unit
CEV
Controlled Environment Vault
Channel
A logical signal within a port. For example, for an EC-1 port, there is one STS-1 channel and some-
times 28 VT1.5 channels. See Port.
Channel State Provisioning
A feature that allows a user to suppress reporting of alarms and events during provisioning by sup-
porting multiple states (automatic, in-service and not monitored) for VT1.5 and STS-1 channels.
See Port State Provisioning.
CIT
Craft Interface Terminal
CLF
Carrier Line Failure Status
CLK
Clock
CMISE
Common Management Information Service Element
CMOS
Complementary Metal Oxide Semiconductor
CO
Central Office
COT
Central Office Terminal
CP
Circuit Pack
CPE
Customer Premises Equipment
CR
Critical (alarm status)
CSA
Carrier Serving Area
CSU
Channel Service Unit
CS&O
Customer Support and Operations
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