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Glossary
Multipoint circuit - a type of DDS network that includes one control
station, attached remote stations, and all channel, MJU and digital
access lines for station interconnection.
O
OCU (Office Channel unit) - a DSU/CSU located in the telco
central office.
OOS (Out Of Service) - a condition that occurs when a digital
service failure is detected by the network.
P
Point-to-point - a circuit with two point directly connected, with no
intermediate nodes, computers or branched circuits (but possibly
switching facilities). A type of connection that links two (and only
two) logical entities (e.g., a phone line circuit). Contrast “multipoint”.
R
Remote station - a device on a multipoint DDS network that
communicates with the master station via the OCU. All remote
stations on the DDS must operate at the same bit rate. (AKA,
“outlying station”.)
RJ (Registered Jack) - a connector for use at customer site (e.g.,
RJ11, RJ45, RJ48).
RTS (Request To Send) - a lead on the terminal interface. Also a
communications device handshaking signal; generated by the
receiving device in order to condition a remote transmitter to begin
data transmission.
S
Serial - a type of communications between two devices in which
data is transmitted one bit at a time.
Subrate - a data transmission rate of less than or equal to 19.2K
bps.
Synchronous transmission - data communications where the
transmitting and receiving devices are synchronized and characters
or bits are sent at a fixed rate.
System status - optional conditioning of the DSR signal.
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