ADTRAN Express 5210 User Manual page 178

Appendix C. Acronyms/Abbreviations
DSR ................... data set ready
DSU ................... data service unit
DTE ................... data terminal equipment
DTR ................... data terminal ready
FECN ................. forward explicit congestion notification
FEP..................... front end processor
FIFO................... first in first out
FR....................... frame relay
FRAD ................ frame relay access device
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
PLAR ................. private line automatic ringdown
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
C-2 Express 5210 User Manual 61200208L1-1