G-2
MDS 4790/9790 Series I/O Guide
MDS 05-3438A01, Rev. F
kbps
—Kilobits-per-second.
Menu Directory
—Front panel display screen
that is the entry point to screens for displaying
radio status and programming the radio. It con-
tains the main menu items Configuration,
Diagnostics, and Event Log.
Multipath Fading
—Signals arriving at the
receiver out of phase, which have a tendency to
cancel each other. It is caused by reflections of
the transmitted wave and results in distortion at
the receiver or weak received signal strength.
Network-Wide Diagnostics
—An advanced
method of controlling and interrogating GE
MDS radios in a radio network.
Non-intrusive diagnostics
—See
Passive mes-
saging
.
Passive messaging
—This is a mode of diag-
nostic gathering that does not interrupt SCADA
system polling communications. Diagnostic
data is collected non-intrusively over a period
of time; polling messages are carried with
SCADA system data (contrast with
active mes-
saging
).
Payload data
—This is the application’s user
communication data which is sent over the
radio network. It is the radio data that is the pri-
mary purpose of the radio communications.
RSSI
—Received signal strength indication.
Expressed in dBm.
RTU
—Remote Terminal Unit. A data collec-
tion device installed at a remote radio site. An
internal RTU
simulator
is provided with
4790/9790 radios to isolate faults to either the
external RTU or the radio.
SNR
—Signal-to-noise ratio. Expressed in
decibels (dB).
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).
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