Vol. VI-B-46 Alcatel-Lucent
Probable Cause
Equipment malafunction.
Recommended Actions
Check Transport Channel Failure and Port Failure alarms.
• If active, replace the DAC.
• If not active (traffic is not affected) DAC replacement is not urgent.
Providing a replacement DAC ES is to hand, try re-booting the alarmed
DAC by withdrawing it from its backplane, pausing, and re-inserting.
Additional Information
The switch provides the port-to-channel bridging and switching functions.
Channel PRBS Test Active
PRBS test applied. This is a warning alarm.
Probable Cause
The built-in BER test has been applied to a channel.
Recommended Actions
To remove the alarm, deselect the test.
Additional Information
In the link test mode traffic on the selected channel is replaced by a pseudo
random bit sequence (PRBS) test pattern. Channel BER from the received
pattern can then be estimated. The test is normally run with the remote DAC ES
or DAC GE in channel loopback. Counters are provided for:
a) The number of errored bits while synchronized to the PRBS
b) The number of error free bits while synchronized to the PRBS
Channel Loopback Active
DAC ES / DAC GE channel data looped back to radio path. This is a warning
alarm.
Probable Cause
A radio facing (bus facing) loopback has been established on a DAC ES / DAC
GE channel using commands in the CT System/Controls screen.
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