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
C37.1
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
DBLL Dead bus live line
DC Direct current
Section 9 1MRK 511 393-UEN A
Glossary
54 670 series 2.2 IEC
Communication protocol manual
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