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Glossary and Abbreviations
555-230-024GL-44 Issue 5 January 1998
SDDN
Software-Defined Data Network
SDI
Switched Digital International
SDLC
Synchronous data-link control
SDN
Software-defined network
SFRL
Single-frequency return loss
SID
Station-identification number
simplex system
A system that has no redundant hardware.
simulated bridged appearance
The same as a temporary bridged appearance; allows the terminal user (usually the principal) to
bridge onto a call that had been answered by another party on his or her behalf.
single-carrier cabinet
A combined cabinet and carrier unit that contains one carrier. See also Multicarrier cabinet.
single-line voice terminal
A voice terminal served by a single-line tip and ring circuit (models 500, 2500, 7101A, 7103A).
SIT
Special-information tones
small computer system interface (SCSI)
An ANSI bus standard that provides a high-level command interface between host computers
and peripheral devices.
SMDR
Station Message Detail Recording, known as Call Detail Recording in DEFINITY ECS.
SN
Switch Node
SNA
Systems Network Architecture
SNC
Switch Node Clock
SNI
Switch Node Interface
SNMP
Simple Network Management Protocol
software
A set of computer programs that perform one or more tasks.
SPE
Switch Processing Element