GE MDS SD Series Technical Manual page 117

Payload data—This is the application's communication data which is
sent over the radio network.
Peer—An operating mode of the transceiver with respect to diag-
nostic/management activities. See also GATE, NODE, and ROOT.
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.
PPM—Parts per Million
Programmable Logic Controller—See PLC.
Remote (Station)—A radio in a network that communicates with an
associated master unit.
Remote Terminal Unit—See RTU.
Redundant Operation—A station arrangement where two transceivers
and two power supplies are available for operation, with automatic
switch-over in case of a failure.
Root—An operating mode of the transceiver with respect to diag-
nostic/management activities. See also GATE, NODE, and PEER.
RTS—Request-to-send
RTU—Remote Terminal Unit. A data collection device installed at a
remote radio site. An internal RTU simulator is provided with the trans-
ceiver to isolate faults to either the external RTU or the radio.
RX—Abbreviation for "Receive." See also TX.
SAF—Store and Forward. An available feature of the radio where data
is stored by a designated Remote, and then retransmitted to a station
beyond the communication range of the AP.
Signal-to-Noise Ratio—See SNR.
SCADA—Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.
SNR—Signal-to-Noise ratio. A measure of how well the signal is being
received at a radio relative to noise on the channel.
MDS 05-4846A01, Rev. H SD Series Technical Manual 107