Vol. VI-B-30 Alcatel-Lucent
Probable Cause
Equipment malfunction.
Recommended Actions
Withdraw the RAC, pause, then reinsert.
Replace the RAC.
ESR Threshold Exceeded
G.826 ESR threshold exceeded. This is a path warning alarm.
Probable Cause
Path conditions, interference, or equipment malfunction.
Recommended Actions
1. Check for other alarms, particularly those that indicate a total LOS due to a
component failure, or a complete path failure:
• Component failure or Rx path failure alarms must be checked before
investigating an RSL Below Threshold alarm.
• If the only other alarms are Demodulator Not Locked, and its downstream
path failure and path warning alarms, a path failure is indicated, which
may be caused by a complete path fade or a remote Tx failure.
2. If ESR Threshold Exceeded is the only alarm, or the only other alarms are
also path warning alarms, check G.826 and RSL measurements at both ends
using the CT Performance screen:
• If low RSL and G.826 alarms are present at both ends of the link, a path
problem is indicated, which most likely will be caused by a degraded path
due to rain, diffraction or mulipath fading. Check recommended actions
for BER alarms.
• If an ESR alarm is present at just the local end and RSL is normal,
interference from another link should be suspected. Use the CT History
and Event Browser screens to track the onset of ESR alarms, which for a
newly installed interferring link should show a repetition of G.826 alarm
occurences as the new link is installed and commissioned.
Additional Information
An ES (errored second) is a one-second period with one or more errored blocks
or at least one defect.
ESR (errored second ratio) is the ratio of ES to total seconds in available time
during a fixed measurement interval. For 9500 MXC the measurement interval is
60 seconds, and the ESR alarm threshold is set at 20%.
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