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Appendix D.Glossary
traffic on the Level 3 LAN protocol (e.g., the internet protocol address). See also
bridge.
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.
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 EIA-232 interface that indicates if the communi-
cations is connected and ready to start handshaking control signals so communi-
cations 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.
switched network
The network of dial-up telephone lines using circuit switching to provide com-
munications services to network users.
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.
synchronous data link control (SDLC)
A link-level communications protocol used in an international business
machines (IBM) systems Network Architecture (SNA) network that manages
synchronous, code-transparent, serial information transfer over a link connec-
tion. SDLC is a subset of the HDLC protocol developed by ISO.
D-8
Express 5200 User Manual
61202175L1-1
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