17
Glossary
100BASE-FX
A physical medium defined in the IEEE 802.3 Ethernet standard for local
area networks (LANs) that uses fiber optic cabling
100BASE-TX
A physical medium defined in the IEEE 802.3 Ethernet standard for local
area networks (LANs) that uses twisted-pair cabling category 5 or higher
with RJ-45 connectors
620 series
Series of numerical protection and control relays for high-end protection
and supervision applications of utility substations, and industrial switch-
gear and equipment
AC
Alternating current
ACT
1. Application Configuration tool in PCM600
2. Trip status in IEC 61850
AR
Autoreclosing
AVR
Automatic voltage regulator
CAT 5
A twisted pair cable type designed for high signal integrity
CAT 5e
An enhanced version of CAT 5 that adds specifications for far end cross-
talk
CBB
Cycle building block
COMTRADE
Common format for transient data exchange for power systems. Defined
by the IEEE Standard.
CPU
Central processing unit
CT
Current transformer
CTS
Clear to send
DAN
Doubly attached node
DC
1. Direct current
2. Disconnector
3. Double command
DCD
Data carrier detect
DFT
Discrete Fourier transform
DG
Distributed generation
DHCP
Dynamic Host Configuration Protocol
DNP3
A distributed network protocol originally developed by Westronic. The
DNP3 Users Group has the ownership of the protocol and assumes re-
sponsibility for its evolution.
DPC
Double-point control
DSR
Data set ready
DT
Definite time
DTR
Data terminal ready
Table continues on the next page
Glossary
1MRS757644 H
1220
620 series
Technical Manual
