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Appendix F. Glossary
half duplex
A circuit designed to both transmit and receive data, but not at the
same time.
in-band
Signaling (dialing, diagnostics, management, configuration, etc.) over
the same channel used for data.
ISDN
Integrated Services Digital Network. A network architecture that
enables end-to-end digital connections. The network supports
diverse services through integrated access arrangements and defines
a limited set of standard, multipurpose interfaces for equipment vendors, network providers, and customers. Interworking with a public
switched telephone network is retained.
LATA
Local Access and Transport Area. One of 161 local geographical areas
in the US within which a local telephone company may offer telecommunications services—local or long distance.
local DTE and loop test
A test initiated by the user that loops the DSU to the central office and
back. This is used to test the local DSU's DTE and local loop.
multi-point
A communications arrangement in which multiple devices share a
common transmission channel, although only one may transmit at a
time. Also referred to as multi-drop.
nonvolatile memory
Memory that is not lost when the power is shut off.
out-of-band
Signaling that is separated from the channel carrying information
(voice, data, video, etc.). Typically the separation is accomplished by
a filter. The signaling includes dialing and other supervisory signals.
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DSU III ARdc User Manual
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