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
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
DFC Data flow control
DFT Discrete Fourier transform
DHCP Dynamic Host Configuration Protocol
DIP-switch Small switch mounted on a printed circuit board
DI Digital input
DLLB Dead line live bus
DNP Distributed Network Protocol as per IEEE Std 1815-2012
DR Disturbance recorder
DRAM Dynamic random access memory
DRH Disturbance report handler
DSP Digital signal processor
DTT Direct transfer trip scheme
ECT Ethernet configuration tool
EHV network Extra high voltage network
EIA Electronic Industries Association
EMC Electromagnetic compatibility
Section 8 1MRK 511 396-UEN E
Glossary
34 SPA, 670 series
Communication protocol manual
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