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Appendix D. Glossary
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 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.
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.
T1
Transmission rate of 1.544 Mbps on T1 communication lines. A T1 facility carri-
ers a 1.544 Mbps digital signal. Also referred to as digital signal level 1 (DS-1).
See also E1.
trunk line
A communications line connecting two frame relay switches to each other.
VT 100
A non-intelligent terminal or terminal emulation mode used for asynchronous
communications. Used to configure the Express 5210.
D-8
Express 5210 User Manual
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