CB Circuit breaker
CBM Combined backplane module
CCITT Consultative Committee for International Telegraph and
T
elephony. A United Nations-sponsored standards body
within the International Telecommunications Union.
CCM CAN carrier module
CCVT Capacitive Coupled Voltage Transformer
Class C Protection Current Transformer class as per IEEE/ ANSI
CMPPS Combined megapulses per second
CMT Communication Management tool in PCM600
CO cycle Close-open cycle
Codirectional Way of transmitting G.703 over a balanced line. Involves two
twisted pairs making it possible to transmit information in
both directions
COM Command
COMTRADE Standard Common Format for Transient Data Exchange
format for Disturbance recorder according to IEEE/ANSI
C37.1
1
1, 1999 / IEC 60255-24
Contra-directional Way of transmitting G.703 over a balanced line. Involves four
twisted pairs, two of which are used for transmitting data in
both directions and two for transmitting clock signals
COT Cause of transmission
CPU Central processing unit
CR Carrier receive
CRC Cyclic redundancy check
CROB Control relay output block
CS Carrier send
CT Current transformer
CU Communication unit
CVT or CCVT Capacitive voltage transformer
DAR Delayed autoreclosing
DARPA Defense Advanced Research Projects Agency (The US
developer of the TCP/IP protocol etc.)
DBDL Dead bus dead line
Section 25 1MRK 511 401-UUS A
Glossary
642 Bay control REC670 2.2 ANSI
Application manual
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