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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