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Appendix C. Acronyms and Abbreviations
C-2 TSU IQ+ User Manual 61200275L1-1
CSU ................... channel service unit
CTS.................... clear to send
CV...................... code violation
dB....................... decibel
DBU................... dial backup
DCD .................. data carrier detect
DCE ................... data communications equipment
DDS................... digital data service
DE...................... discard eligible
DLCI.................. data link connection identifier
DS0.................... digitalsignallevelzero
DSAP................. destination service access point
DSR ................... data set ready
DSU................... data service unit
DSX ................... digitalsignalcrossconnect,level1
DTE ................... data terminal equipment
DTR................... data terminal ready
EA ...................... extended address
EBCDIC............ extended binary coded decimal interexchange code
EER.................... excess error rate
ESF..................... extended superframe
FCS .................... frame check sequence
FDL.................... facility data link
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