Crocus SHDSL G703.pdf - FTP Directory Listing
Crocus SHDSL G703.pdf - FTP Directory Listing
Crocus SHDSL G703.pdf - FTP Directory Listing
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136 <strong>Crocus</strong> <strong>SHDSL</strong> G703 Chapter 6<br />
Reference manual<br />
Configuration attributes<br />
Configuring the retrain criteria<br />
The retrain structure contains the following elements:<br />
Element<br />
enabled<br />
Use this element to enable (yes) or disable (no) retraining.<br />
So when selecting no, the <strong>Crocus</strong> <strong>SHDSL</strong> G703<br />
will never retrain (even not when the line is disconnected).<br />
errorPersistence-<br />
Time<br />
Description<br />
Use this element to set the period, in seconds, during<br />
which each criterion is measured. If within this period<br />
the predefined criterion value is equalled or<br />
exceeded, the <strong>Crocus</strong> <strong>SHDSL</strong> G703 retrains.<br />
Default:yes<br />
Range: -<br />
Default:10<br />
Range: -1 … 30<br />
The errorPersistenceTime functions as a moving window, so it ‘s always the last seconds,<br />
equal to the errorPersistenceTime, that are used to calculate the average.<br />
errorThreshold<br />
Use this element to set the amount of CRC errors, per<br />
mille, at which the <strong>Crocus</strong> <strong>SHDSL</strong> G703 should<br />
retrain. If the amount of CRC errors exceeds this<br />
Default:10<br />
Range: 1 … 300<br />
value (measured during the errorPersistenceTime), then the <strong>Crocus</strong> <strong>SHDSL</strong> G703<br />
retrains.<br />
Remark<br />
The errored <strong>SHDSL</strong> frames can be monitored using the performance attribute<br />
crocusShdslTtRpG703/line/linePair[ ]/performance/codeViolations.<br />
snrThreshold<br />
Use this element to set the signal to noise ratio, in dB, Default:23<br />
which has to be maintained. If the measured signal to Range: 20 … 25<br />
noise ratio drops below this value (measured during<br />
the errorPersistenceTime), then the <strong>Crocus</strong> <strong>SHDSL</strong> G703 retrains.<br />
If you configured the <strong>Crocus</strong> <strong>SHDSL</strong> G703 in …<br />
• a fixed speed, then the <strong>Crocus</strong> <strong>SHDSL</strong> G703 tries to retrain again at this fixed<br />
speed. If the retrain is successful, then the <strong>Crocus</strong> <strong>SHDSL</strong> G703 operates at<br />
this fixed speed again. If the retrain is not successful, then the <strong>Crocus</strong> <strong>SHDSL</strong><br />
G703 retrains again. If the line conditions are so bad that the fixed speed can<br />
no longer be attained, then the <strong>Crocus</strong> <strong>SHDSL</strong> G703 keeps retraining.<br />
• auto speed, then the <strong>Crocus</strong> <strong>SHDSL</strong> G703 initially tries to retrain at the speed<br />
it was trained before. If this does not work, then it tries to train on a lower speed.<br />
Remark<br />
The snrThreshold is only taken into account as a retrain criterion after the line has<br />
been in data state for 2 minutes.
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