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Glossary
Glossary-73980-A2-GB30-40 October 1998
Shared Diagnostic Control Panel. A feature that allows carrier-mounted devices to share the
same diagnostic control panel.
Shared Diagnostic Unit. A circuit card installed in Slot 0 of the COMSPHERE 3000 Series
Carrier that provides an interface between an optional SDCP or network management system
and the devices in the carrier.
An SDCP key that allows the selection of a specific card slot in the COMSPHERE 3000 Series
Carrier.
A test that checks most hardware components when power is applied to the device or a reset is
initiated.
A way of transmitting data in which bits are sent sequentially one at a time.
A factory-preset configuration area containing configuration options most often used in
synchronous dial networks.
Concurrent, such as a data transmission synchronized by a time signal that accompanies the
data.
Data transmission that is synchronized by timing signals. Characters are sent at a fixed rate.
Transmission in which the data characters and bits are transmitted at a fixed rate with transmitter
and receiver synchronized. This eliminates the need for start and stop bits as used in
asynchronous transmission, and is thus faster and more efficient.
Latin for
thrice
. Used to denote the third version of a standard or recommendation, as in V.27ter.
Amount of data, or the number of data units per units of time, that pass through the network
when it is operating a peak capacity.
The starting point of the menu tree that displays second-level menu branches.
A process where two modems try to establish a connection over the telephone (voice frequency)
line.
An operating system developed at AT&T Bell Laboratories and since used as the basis of similar
operating systems.
A factory-preset configuration area containing the configuration options most often used in a
UNIX dial network.
Universal Service Ordering Codes. Generic telephone company service ordering codes.
An ITU-T fax communications standard for devices operating half-duplex with synchronous data
at 14,400 bps.
An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data at
1200 bps over the dial network (PSTN).
An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data at
1200 or 2400 bps over the dial network (PSTN).
An ITU-T communications standard for modems operating in synchronous mode at 4800 or
2400 bps.
An ITU-T fax communications standard for modems operating half-duplex with synchronous data
at 2400 and 4800 bps.
An ITU-T communications standard for modems operating half-duplex with synchronous data at
7200 and 9600 bps.
An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data at
4800 or 9600 bps on switched (dial) or leased telephone lines.
SDCP
SDU
Select key
self-test
serial transmission
Sync Dial
synchronous
synchronous data
synchronous
transmission
ter
throughput
Top-Level menu
training
UNIX
UNIX Dial
USOC
V.17
V.22
V.22bis
V.27bis
V.27ter
V.29
V.32