User's Manual

MDS 05-6302A01, Rev. B MDS Mercury 16E Technical Manual 47
Note that the term “Downlink” refers to the wireless path from the Base
Station to the Subscriber and the term “Uplink” refers to the Subscriber
to Base Station path. In addition to the packet and byte statistics, each
unit provides packets-per-second and kilobits-per-second metrics in real
time. The Clear WiMAX Statistics button can be clicked to reset the packet
and byte counters and the rate indicators.
5.3 Common Troubleshooting Scenarios
Table 13 lists common difficulties that may be encountered, and
suggests remedies to restore proper operation of the wireless system.
Table 13. Troubleshooting Checks
Symptom Possible Cause/Remedy
Unit does not boot 1. Primary power disconnected or power source has failed.
2. Primary power may be below 10 Vdc.
Subscriber does not
link
1. Modem at Base Station or Subscriber may be disabled.
2. Base Station and Subscriber radio configurations may not
match.
3. Base Station transmitter power may be turned down.
4. Base Station and Subscriber WiMAX security settings may
not match.
5. The antenna(s) may be misaligned.
Unable to pass data
end-to-end
1. The Subscriber may not be linked.
2. An Ethernet port at the Base Station or Subscriber may be
disconnected or disabled.
3. The Base Station or Subscriber may be misconfigured in
regard to VLAN and VLAN trunk port settings.
4. The IP addressing of the source and destination devices
may be mismatched.
Weak or poor
quality signal at
Subscriber
1. The Base Station transmit power may be set too low. Check
the gain and loss in the antenna system and cabling to
determine the maximum allowable transmit power.
2. The antenna(s) may be misaligned.
3. The signal path may be too obstructed. Attempt to find a
better location for the antenna.
4. There may be too much interference on the channel or an
adjacent channel. Use a spectrum analyzer to view the RF
activity in the band. Move operation to a different frequency if
available.
5. The radio hardware may be damaged. Test the unit on a
bench cabled directly (through an attenuator) to another
known working unit.