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Appendix D. Glossary
D-12 TSU IQ+ User Manual 61200275L1-1
service
The provision of telecommunications to customers by a common carrier, admin-
istration, or private operating agency using voice, data, and/or video technolo-
gies.
SES
severely errored second. A second in which more than 319 code violations (CVs)
occurred or an OOF condition occurred.
SF
See superframe.
SNA
systems network architecture. The IBM protocol group which governs main-
frame communication.
SNMP
simple network management protocol. A control and reporting scheme widely
used to manage devices from different vendors. SNMP operates on top of the
internet protocol.
SR
data set ready. A signal on the DTE interface that indicates if the communica-
tions is connected and ready to start handshaking control signals so communica-
tions can begin.
statistical multiplexing
Interleaving the data input of two or more devices on a single channel or access
line for transmission through a frame relay network. Interleaving of data is
accomplished using the DLCI.
superframe (SF)
A T1 framing format in which 192-bit frames are grouped into 12 frame super-
frames and all 12 framing bits are used for all frame synchronization.
switched network
The network of dial-up telephone lines using circuit switching to provide com-
munications services to network users.