
114 FSU User Manual 61200.130L1-1
Acronyms and Abbreviations
FECN ......................................................forward explicit congestion notification
FEP ..........................................................front end processor
FIFO ........................................................first in first out
FR ............................................................frame relay
FRAD ......................................................frame relay access device
FRF ..........................................................frame relay forum
FSU..........................................................frame relay service unit
HDLC .....................................................high-speed data link control
IP .............................................................internet protocol
ISDN .......................................................integrated services digital network
ITU ..........................................................International Telecommunications Union
KA ...........................................................keep alive
LAN ........................................................local area network
LED .........................................................light emitting diode
LLC .........................................................logical link control
LMI..........................................................local management interface
LRC .........................................................lateral redundancy check
MIB..........................................................management information base
ms............................................................millisecond
NRZ ........................................................non-return to zero
NRZI .......................................................non-return to zero inverted
OCU ........................................................office channel unit
OOS.........................................................out of service
PPP..........................................................point to point protocol
PU............................................................physical unit
PVC .........................................................permanent virtual circuit
RD ...........................................................receive data
RDL.........................................................remote digital loopback
RFC .........................................................request for comments
RFECN....................................................remote forward explicit congestion notification
RIP...........................................................routing information protocol
RMA........................................................return material authorization
RR............................................................receiver ready
RS ............................................................recommended standard
RTS ..........................................................request to send
Rx ............................................................receive
SAP .........................................................service access point
SDLC.......................................................synchronous data link control
SLIP.........................................................serial line internet protocol
SNA.........................................................systems network architecture
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