102
SD Series Technical Manual
MDS 05-4846A01, Rev. F
Payload data
—This is the application’s user communication data
which is sent over the radio network. It is the transfer of payload data
that is the primary purpose of the radio communications 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 swi-
tchover 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.”
SAF—
Store and Forward. An available feature of the SD 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.
