User Manual

BRITECELL System Manual MN010-04 June 2003 Page 25 of 78
The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.
13. Troubleshooting
Correct alarm interpretation is very useful not only during the installation, but also
during maintenance
TFL laser failure:
replace the faulty transmitter by replacing the TFL unit with a new one.
RX alarm only:
first go to the TFL site and check if optical connectors of TFL are properly
cleaned.
If the problem still exists, go to the TFA site (the TFA which yields also
visual RX alarm at TFL). If the TFA shows a visual alarm, clean the
downlink optical connector.
If the TFA is still alarmed, measure the downlink optical power at TFA
input with an optical power meter and verify if it is higher than –5 dBm. If
it is not, the fibre cable (at least as far as the downlink fibre is concerned)
has some problems. If optical power is higher than –5 dBm, replace the
TFA.