Actelis Networks ML700 - Modem Ports Alarms Troubleshooting

Appendix F - Alarms Troubleshooting
ML700 User Manual F-5
Modem Ports Alarms Troubleshooting
Table 105: Modem Ports alarms troubleshooting table
Condition
Type
Description
Recommended Troubleshooting Procedure
HIATTN
High loop attenuation;
Current loop attenuation on MLP is
equal or exceeds a threshold value
configured for this MLP. Alarm
condition is cleared when loop
attenuation drops below the threshold
value by at least 1dB.
The condition is used as a system performance
analysis tool.
Loop attenuation is a product of SNR margin and
BER. The HSL automatically maintains control on
SNR Margin in order to provide sufficient BER level
in the copper loop.
To eliminate the condition, reconfigure the condition
threshold. Do not re-calibrate the HSL, since
HIATTN is not a fault condition.
LOSW
Loss of Synchronization Word;
The MLP has lost synchronization.
This condition is MJ, SA if modem
belong to the HSL with LOWBW
Threshold Control enabled and crossed.
The condition is applicable on HSL in -
O (Office) mode only.
In all other cases this condition is MN,
NSA.
This problem is typically caused by temporary
disturbances, such as micro-interruptions or transient
noise.
To determine whether problem is temporary or
persistent, perform the following:
 In Modem Ports pane, click Details (All
Modems) button. Details For Modem Ports pane
opens.
 Check the details for the specified MLP for the
system.
If the problem persists, try the following procedures
in the suggested order:
 Follow the instructions in Analyzing Results of
the Line Qualification Routines to eliminate a
modem mismatch as a possible cause.
 Check the copper pairs (lines). Repair/replace
lines, as necessary; check out RJ45 connectors.
When replacing pairs, be careful not to
disconnect adjacent pairs.
LOWSNRM
Low SNR margin;
Current SNR margin on MLP is equal
or less than a threshold value
configured for this MLP. Alarm
condition is cleared when SNR margin
returns to +1 dB above the threshold
value.
The condition is used as a system performance
analysis tool.
The HSL automatically maintains control on SNR
Margin in order to provide sufficient BER level in
the copper loop.
To eliminate the condition, reconfigure the condition
threshold. Do not re-calibrate the HSL, since
LOWSNRM is not a fault condition.
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