ADTRAN TSU IQ+, 1204002L2 user manual Ses

Appendix D. Glossary

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.

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