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Appendix D. Glossary
D-10 MX2800 STS-1 User Manual 61200659L1-1
router
A device that supports communications between networks. Routers are similar to
bridges, with the exception that routers provide more functionality (such as find-
ing the best route between networks and providing network management capa-
bilities).
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.
signaling
Communication between switches to set up and terminate calls.
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.
SONET
Synchronous optical network. A standard format for transporting a wide range of
digital telecommunications services over optical fiber. SONET is characterized
by standard line rates, optical interfaces, and signal formats.
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.