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Glossary
Control station - the station on a DDS multipoint circuit that is
nearest the host system and transmits data to each remote station
and receives a single serial bit stream from the remote stations via
the MJU.
Crossover cable - a cable with a conductor that runs the length of
the cable, but connects to a different pin number at each end
(connects pins 2 to 3 and 3 to 2 from DTE to DSU/CSU).
CSU (Channel Service Unit) - a device used to terminate a digital
circuit (such as DDS or T1) at the customer site. Used in
combination with a “DSU”.
D
Data Communications Equipment (DCE) - equipment that
provides the function to establish, maintain and terminate a
connection. Additionally, provides the signal conversion required for
communications between DTE and data circuit or telephone line.
See also “DTE”.
DDS (Dataphone Digital Service) - AT&Ts private-line end-to-end
digital service, with data rates (typically) at 2400, 4800, 9600,
19200, and 56000 bps. Now an AT&T “Accunet” family offering. The
DDS is a synchronous network that uses the ABATS test system,
which requires little manual intervention.
Default - the factory set position or value that a device assumes at
startup. An alterable parameter.
Digital loopback - a type of diagnostic test where the transmitted
signal is returned to the sending device after passing through a data
communications link; the returned signal is then compared to the
transmitted signal.
DSR (data set ready) - an RS232 signal that indicates the DCE and
line are ready to receive data.
DSU (Data Service Unit) - a device used to interface a user’s DSU
to a digital circuit (such as DDS or T1). Used in combination with a
“CSU”.
Data Terminal Equipment (DTE) - a device that provides output
data in the form of digital signals. See also “DCE”.
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