C37.94
IEEE/ANSI protocol used when sending binary signals
between IEDs
CAN
Controller Area Network. ISO standard (ISO 11898) for serial
communication
CB
Circuit breaker
CBM
Combined backplane module
CCITT
Consultative Committee for International Telegraph and
Telephony. 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
C37.111, 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
Section 5
1MRK 511 413-UUS B
Glossary
52
650 series 2.2 ANSI
Communication protocol manual
