GE MDS SD Series Technical Manual page 78

70
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Table 14. Troubleshooting Guide
Difficulty Recommended System Checks
Unit is
a. Check for the proper supply voltage at the power
inoperative.
connector.
b. The transceiver's internal fuse may have opened. Factory
repair is required.
Interference or
a. Use the Spectrum Analyzer/Graph function to check for
signal overload is
interference near the radio channel.
suspected.
b. Try re-orienting the station antenna to limit interference to
and from other stations.
c. For excessively strong signals, set RX Signal Attenuation
to ON (Configuration>>Radio>>Advanced Settings). Note:
Also affects the strength of desired, on-channel signals.
No link with Master,
a. Check for secure interface connections at the radio and
or poor overall
the connected device.
performance.
b. Check the antenna, feedline and connectors. Reflected
power should be less than 10% of the forward power reading
(SWR  2:1 or lower).
c. If the Remote radio links, but performance is poor, check
the received signal strength using the RSSI feature on the
Radio Performance screen. If RSSI is low, it may indicate
antenna problems, or misalignment of directional antenna
headings.
d. Verify proper programming of system parameters: mode,
data interface baud rate, RF output power, etc.
e. Check for alarms using the Statistics/Events screen.
No communication a. Verify correct IP address is set.
to user interface
b. Ensure PC is set to same subnet as radio.
(Ethernet system)
Ethernet port shuts a. Excessive data throughput. Do not connect radio to a LAN
down with high traffic levels.
b. Auto Power Save is shutting the port down. Disable Auto
Power Save on Ethernet Port Configuration screen.
No communication a. Connect terminal emulator to COM1 port, cycle power,
to user interface and press the Enter key within 10 seconds to obtain Login
(serial system) prompt.
SD Series Technical Manual MDS 05-4846A01, Rev. D