MDS 05-4846A01, Rev. F
SD Series Technical Manual
87
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.
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.
Table 15. Event Codes
(Continued)
Event
Code
Event
Class
Description
Table 16. Operating Constraints
Constraint
Detailed Information
Minimum Firmware Version
Requirement
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.
RSSI display in Strong
Signal Environments
The RSSI facility limits the maximum displayed signal
strength to –60 dBm.
Radio Operation in Strong
Signal Environments
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.
DC Input Voltage (SD4)
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.
