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Appendix D, Acronyms/Abbreviations
MX2800 STS-1 User Manual
Letter D
D
dB ................................. decibel
DBU.............................. dial backup
DCD.............................. data carrier detect
DCE.............................. data communications equipment
DDS .............................. digital data service
DLCI ............................ data link connection identifier
DS1 ............................... digital signal level one
DS3 ............................... digital signal level three
DSR .............................. data set ready
DSU .............................. data service unit
DSX-1 ........................... digital signal cross connect, level 1
DTE .............................. data terminal equipment
DTR.............................. data terminal ready
E
ES ................................. errored seconds
Eq ................................. equipment
Eqpt.............................. equipment
EXZ .............................. excessive zeros
F
FBE............................... F-bit errors
FCC .............................. Federal Communications Commission
FDL .............................. facility datalink
FEAC ........................... far-end alarm and control
FEBE............................ far end block error
H
HSSI ............................. high-speed serial interface
I
IP .................................. internet protocol
K
KA ................................ keep alive
D-2
61204659L1-1A
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