INSTALLATION AND MAINTENANCE MANUAL
E1 FAMILY
LICENSED & SPREAD SPECTRUM RADIOS
JUNE 2001
SECTION 4: TROUBLESHOOTING
PAGE 4-9
4.6.2
BER (Bit Error Rate) Alarm
Function:
This LED indicates that the traffic being received from the far-end radio is exceeding the bit error
rate threshold of the radio (approximately 1 x 10
-6
). This indicates that radio traffic currently has
errors on it which may exceed acceptable levels. This LED will stay ON as long as the BER
threshold is being exceeded. In some cases, it will turn ON and OFF, in which case there are
bursts of errors causing intermittent degradation to the received data. In all cases, the LED will be
on for at least 1 second for any group of errors which exceed the threshold, whether they are a burst
of errors or a long string of errors.
If the RX SYNC alarm is on the near-end or far-end radio in
addition to the BER alarm (on the same radio), the RX SYNC
alarm should be the first priority for troubleshooting.
Possible Causes:
v
Path fading due to atmospheric conditions (usually accompanied by Far-End BER alarm)
and low RSL voltage reading
v
Poor transmission line connections (usually accompanied by Far-End BER alarm) and
low RSL voltage reading
v
Antenna problems, misalignment or path clearance (usually accompanied by Far-End
BER alarm) and low RSL voltage reading
v
Interference
v
Received signal level (RSL) is too strong
v
Far-end radio transmitter circuitry is faulty or Tx Power adjusted incorrectly (too low)
v
Near-end radio receiver circuitry is faulty
