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MT56DSU2 Owner’s Manual
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M
master station — see “control station”.
MJU (Multipoint Junction Unit) — a digital data bridge, located at telco office, for the DDS network. Used
to combine remote station’s bit streams into one serial bit stream for transmission to the control station.
Multi-drop — see “multipoint”.
multipoint — a single line or circuit that connects several stations supporting terminals located in different
areas. Usually requires some type of pooling method. Contrast “point-to-point”.
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.
0
OCU (Office Channel unit) — a DSUICSU 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.