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Appendix D. Glossary
61200217L1-1 T3SU 300 User Manual D-9
POP
point of presence. Physical place within a LATA (local access and transport area)
where a long distance carrier or a cellular provider interfaces with the network
of the local exchange carrier (LEC). A POP is usually a building serving as the
point of termination which houses switches and transmission equipment.
protocol
A set of rules controlling the orderly exchange of information between stations
in data communications networks or systems.
PSTN
public switched telephone network. Usually refers to the world wide voice tele-
phone network available for public use.
red alarm
Unframed all ones signal (keep alive signal). A red alarm is declared on detec-
tion of LOS or OOF not caused by an alarm indication signal (AIS) that persists
for more than two seconds.
remote configuration
A feature designed into ADTRAN products that allows remote units to be con-
figured from a local unit or a VT 100 compatible terminal.
router
A device that supports communications between networks. Routers are similar
to bridges, with the exception that routers provide more functionality (such as
finding the best route between networks and providing network management
capabilities).
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.
service provider
A company that delivers or sells a telecom service.
SES
severely errored seconds. A second in which more than 320 code violations
(CVs) occurred or an OOF condition occurred.