ADTRAN 1200218L1, User Manual

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Appendix D. Glossary
D-10 OSU 300 User Manual 61200663L1-1
SC
A snap-on fiber optic connector.
SES
severely errored seconds. A second in which more than 320 code violations
(CVs) occurred or an OOF condition occurred.
signaling
Communication between switches to set up and terminate calls.
single-mode
An optical fiber allowing a single mode of light to propagate.
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 a connection exists
and if the devices are ready to start handshaking control signals so communica-
tions can begin.
ST
A fiber optic connector plug and socket.
synchronous
Communications in which the timing is achieved by sharing a single clock. Each
end of the transmission synchronizes itself with the use of clocks and informa-
tion sent along with the transmitted data.
T1
Transmission rates of 1.544 Mbps are available on T1 communication lines. Also
referred to as digital signal level 1 (DS-1). See also E1.
T3
Transmission rates of 44.736 Mbps are available on T3 communication lines. Also
referred to as digital signal level 3 (DS-3).