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Appendix C. Acronyms/Abbreviations
DSR ................... data set ready
DSU ................... data service unit
DSX-1 ................ digital signal cross connect, level 1
DTE ................... data terminal equipment
DTR ................... data terminal ready
ES ....................... errored seconds
EXZ .................... excessive zeros
FDL .................... facility datalink
FEBE .................. far end block error
HSSI .................. high-speed serial interface
IP........................ internet protocol
KA...................... keep alive
LAN ................... local area network
LCV ................... line coding violation
LED.................... light emitting diode
LES..................... line errored seconds
LL ....................... local loopback
LOS.................... loss of signal
MBE................... M-bit errors
Mbps ................. megabits per second
MIB.................... management information base
ms....................... millisecond
NC...................... normally closed
NI ....................... network interface
NMS .................. network management system
NO ..................... normally open
NRZ ................... non-return to zero
OCU................... office channel unit
OOF ................... out of frame
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T3SU 300 User Manual
61202217L1-1B
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