User's Manual

38 MDS iNet 900 Installation Guide MDS 05-2873A01, Rev. A
DRAFT 6—8/29/01
Mode—This refers to the programmed function of an MDS spread spec-
trum radio—Access Point or remote. (See also Station Adaptor and
Access Point Station.)
Multiple Address System (MAS)—See Point-Multipoint System.
Network Address—User-selectable number between 1 and 65000 that
is used to identify a group of transceivers that form a communications
network. The Access Point and all remotes within a given system must
have the same network address.
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Network-Wide Diagnostics—An advanced method of controlling and
interrogating MDS radios in a radio network.
Point-Multipoint System—A radio communications network or
system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.
Poll—A request for data issued from the host computer (or master PLC)
to a remote radio.
PLC—Programmable Logic Controller. A dedicated microprocessor
configured for a specific application with discrete inputs and outputs. It
can serve as a host or as an RTU.
Remote Radio—A radio in a spread spectrum network that communi-
cates with an associated Access Point station. A radio may be pro-
grammed for either Access Point or remote mode using software
commands. See Section 6.0, PROGRAMMING (beginning on page 21).
Remote Terminal Unit—See RTU.
RTU—Remote Terminal Unit. A data collection device installed at a
remote radio site.
SCADA—Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.
Standing Wave Ratio—See SWR.
SWR—Standing Wave Ratio. A parameter related to the ratio between
forward transmitter power and the reflected power from the antenna
system. As a general guideline, reflected power should not exceed 10%
of the forward power (≈ 2:1 SWR).
Zone—See Frequency Zone.
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