WDS P20, Инструкция по установке и эксплуатации

Страница: 10 / 32

6
MCU —Microcontroller Unit. This is the processor responsible for con-
trolling system start-up, synthesizer loading, hop timing, and key-up
control.
Microcontroller Unit —See MCU .
Multiple Address System (MAS) —See Point-Multipoint System.
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.
Programmable Logic Controller —See PLC .
Remote (Station)—A radio in an MAS network that communicates
with an associated master station.
Remote Terminal Unit—See RTU.
Redundant Operation—A station arrangement where two transceivers
and two power supplies are available for operation, with automatic
switchover in case of a failure.
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.
Supervisory Control And Data Acquisition—See SCADA.
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).