GE MDS SD Series Technical Manual page 100

92
Table 16. Operating Constraints
Constraint
Minimum firmware version
requirement
RSSI display in strong
signal environments
Radio operation in strong
signal environments
DC input voltage (SD4)
SD Series Technical Manual
Detailed Information
When operating in "Packet w/MAC" mode, do not
downgrade the firmware revision below REV4.0.0.
Doing so will cause erratic and unpredictable behavior,
including causing the radio to become continuously
keyed.
The RSSI facility limits the maximum displayed signal
strength to –60 dBm. Signal levels that are higher than
-60 dBm will appear as > -60 dBm.
Operation with very strong receive signals (> -60 dBm)
may require selection of the programmable RX Signal
Attenuation feature (see Advanced Settings
screen). Some higher bandwidth modems (e.g.,
65000) may require further external attenuation if
operating at even stronger signal levels (> -35dbm).
Note that this is rarely a practical concern; the most
likely scenario is in bench testing. Typical field
deployments have normal signal strengths well below
this threshold.
Early SD4 models supported 10.5 to 16 Vdc power, not
10 to 30 Vdc. Check the labeling above the power
connector to confirm the operating range for your unit.
MDS 05-4846A01, Rev. H