
Appendix C. Acronyms and Abbreviations
C-2 IQ Probe User Manual 61200214L1-20
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
GUI graphical user interface
HDLC high-speed data link control
IA inactive
IP internet protocol
ISDN integrated services digital network
ITU International Telecommunications Union
IXC interexchange carrier
KA keep alive
kbps kilobits per second
LAN local area network
LEC local exchange carrier
LED light emitting diode
LI link integrity
LMI local management interface
MIB management information base
ms millisecond
NI network interface
OCU office channel unit
POP point-of-presence
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
RS request to send; also recommended standard
RTS request to send
Rx receive
SAP service access point
SDLC synchronous data link control
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