User's Manual

INSTALLATION AND MAINTENANCE MANUAL
Tsunami FAMILY
SPREAD SPECTRUM RADIOS
SEPTEMBER 1999
SECTION 4: TROUBLESHOOTING PAGE 4-15
4.7 Errors in the Data Stream
When the radio is in service, errors in the data stream may occur. This is usually known to the
operator by either faulty data indications of downstream equipment, or ERROR LED indications
during internal link testing.
During internal test mode link testing, if an error is detected, the ERROR LED will illuminate. In
default mode, this lamp will stay lit during link testing if a single error is detected. If Link Test has
been performed over a period of time and the ERROR LED does not latch on, the radio link is
operating completely error-free.
The ERROR LED only operates in internal test signal link test
mode.
It is possible that no alarms appear on the front panel during normal operations, but there are
errors present in the data stream. If the BER LED is lit, this indicates rather severe error
conditions and it is best to follow the procedures provided in Section 4.6.1. In the case of this type
of error, the following information can be helpful to troubleshoot the radio link.
Indications:
❖ In Link Test Mode, ERROR LED is illuminated
❖ Downstream equipment (Router, Switch, Hub, etc.) indicates errors
Possible Causes:
❖ Path fading due to atmospheric conditions
❖ Poor transmission line connections
❖ Antenna problems, misalignment or path clearance
❖ Received signal level (RSL) is too strong
❖ Far-End radio transmitter circuitry is faulty
❖ Near-End radio receiver circuitry is faulty
❖ Interference
Recommended Actions:
1. Verify 10BaseT wiring.
2. Even if the BER alarm LED is unlit but errors continue, follow the instructions described in
Section 4.6.1