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Glossary Chapter 14
Glossary
Contra-directional Way of transmitting G.703 over a balanced line. Involves four twisted
pairs of with two are used for transmitting data in both directions, and
two pairs for transmitting clock signals
CPU Central Processor Unit
CR Carrier Receive
CRC Cyclic Redundancy Check
CS Carrier send
CT Current transformer
CVT Capacitive voltage transformer
DAR Delayed auto-reclosing
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
DFT Discrete Fourier Transform
DIP-switch Small switch mounted on a printed circuit board
DLLB Dead line live bus
DR Disturbance Recorder
DRH Disturbance Report Handler
DSP Digital signal processor
DTT Direct transfer trip scheme
EHV network Extra high voltage network
EIA Electronic Industries Association
EMC Electro magnetic compatibility
EMI Electro magnetic interference
ESD Electrostatic discharge
FOX 20 Modular 20 channel telecommunication system for speech, data and
protection signals
FOX 512/515 Access multiplexer
FOX 6Plus Compact, time-division multiplexer for the transmission of up to seven
duplex channels of digital data over optical fibers
FXM IEC 61850, Optical Ethernet Card
G.703 Electrical and functional description for digital lines used by local tele-
phone companies. Can be transported over balanced and unbalanced
lines
G.711 Standard for pulse code modulation of analog signals on digital lines
GCM Communication interface module with carrier of GPS receiver module
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