GE MDS SD Series Technical Manual page 96

88
Table 14. Troubleshooting Guide (Continued)
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. (As of
this manual's release date, this must be performed using a
console terminal session. Device Manager access is
planned for a future release.) Note that access to the unit via
Ethernet will not be possible if the port is currently shut down.
About Auto Power Save: This feature, enabled by default,
shuts down the Ethernet port if no connection is detected for
approximately 10 seconds, such as when a cable is
unplugged. Ethernet communications will resume when the
connection is restored. If your system experiences Ethernet
connection difficulties in operation, the Auto Power Save
feature may be disabled. A port that is shut down may also
be restored by cycling the radio's DC power input.
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.
BER is too high. a. If in packet mode, check the Packet Settings screen for
Data throughput is proper configuration.
spotty.
b. If in serial mode, check the COM1/COM2 Port settings
screen for proper configuration.
Latency is too high.
a. Adjust packet mode settings.
Unit won't wake up a. Disconnect the device connected to COM2, and disable
from Sleep Mode. Sleep Mode on the Device Settings Screen.
b. Verify that the connected device is outputting the required
0 Vdc to 5 Vdc to control sleep mode on Pin 4 of COM2.
Correct as necessary.
c. Re-enable Sleep Mode on Device Settings Screen,
re-connect device to COM2, and check for proper operation.
SD Series Technical Manual MDS 05-4846A01, Rev. H