Appendix D. Glossary
D-8
T1 ESF CSU ACE User Manual
61203025L1-1
SDLC
synchronous data link control. A link-level communications protocol used in an
international business machines (IBM) systems Network Architecture (SNA)
network that manages synchronous, code-transparent, serial information trans-
fer over a link connection. SDLC is a subset of the HDLC protocol developed by
ISO.
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 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.
Summary of Contents for Cable T1 ESF CSU ACE
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