Operating Constraints - GE MDS SD4A Technical Manual

MDS 05-4846A01, Rev. F
Table 15. Event Codes (Continued)
Event Event
Code Class Description
027 Minor #27 Reserved.
028 Minor #28 Reserved.
029 Minor RF Output Power not in valid range.
030 Minor #30 Reserved.
031 Minor Internal temperature approaching limit.
037 Minor Unexpectedly executing APP 1.
038 Minor Unexpectedly executing APP 2.
039 Minor Boot error; active image unknown.
042 Minor Reprogramming failure.
064 Minor A socket operation failed.
070 Minor AP not available.
041 Status Forced restart of Ethernet interface.
043 Status Reprogramming in progress.

7.3 Operating Constraints

The SD transceiver is a flexible unit offering a wide variety of features
needed in the wireless data industry today. While many system arrange-
ments and applications are possible, there are a few constraints that
system planners should be aware of when designing a radio network.
Table 16 lists these constraints and explains how to avoid difficulty in
operation.
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 REV400.
Downgrading firmware to a lower revision 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.
Operation with very strong receive signals (>-60db)
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.
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