5. Diagnostics and Troubleshooting
5-10
April
2002
8000-A2-GB26-70
Example 2. Remote Unit (Downstream Channel) Retrain
The following SYSLOG messages have been received:
02/18/2000 09:53:32 S/N Threshold Reached, port DSL port 4
02/18/2000 09:53:50 Remote Started at 02/18/2000 09:53:28
02/18/2000 09:53:50 Remote Reed Solomon Restart, Port 4
Meaning:
The port S/N ratio has been reached. The port card retrained after the remote unit
as indicated by the embedded timestamp at the end of the remote SYSLOG
message. This retrain was caused by Reed Solomon errors. In general, if the port
card is experiencing a line performance problem and enters the retrain state first,
the remote unit typically retrains due to Reed Solomon Restart. If the remote unit
enters the retrain state first, the port card will typically show a S/N Threshold
Reached error message.
Example 3. System Status Message
The following SYSLOG message have been received:
02/18/2000 11:13:15 Link Transition Threshold Exceeded, port DSL2
Meaning:
The number of DSL retrains (transitions) has exceeded the Link Down Count
configured on the DSL Parameters screen (A-B-B). This is checked every
15 minutes when the current 15-minute bucket is shifted to the previous 15-minute
bucket. There will never be more than one SYSLOG message for each 15-minute
period. The Link Down Count only determines if a trap is sent. It has no effect on
when the units will retrain.
Example 4. Port Card Status Messages
The following SYSLOG messages have been received:
02/18/2000 10:25:31 Margin Threshold Exceeded, DSL port 3
02/18/2000 10:26:36 ALARM: DSL3 Margin Low Set
02/18/2000 10:27:42 Margin Threshold Normal, port DSL3
02/18/2000 10:28:50 ALARM: DSL3 Margin Low Clear
Meaning:
The margin has gone below what was set as a startup margin on the DSL
Parameters screen (A-B-B) and an alarm message has been sent to the NMS.
Then, the margin returned to a value above what has been set on the DSL
Parameters screen and the message has been sent to the NMS.
