MINSNRM on Vigor2820 Router
Posted by on 17 January 2012 03:55 PM

MINSNRM is the Minimum Noise Margin for both upstream and downstream ADSL communications.




A customer notified us that he saw the message in the syslogs.

 It restarted the ADSL connection after a message about

...SNR Margin value lower than MINSNRM, rebooting DSL state machine was

   saved in SysLog.


Is MINSNRM an attribute of each type of ADSL connection ?

ie... Does 211011/Std have a fixed setting ? And 211801 another

setting ?  Or can it be tuned for a specific line ? ISP can set STABLE or NORMAL connection at the exchange (or

they could for ADSL ?).

Is there any way to find what MINSNRM is set to (for Vigor 2820Vn) ?

Does it change with firmware updates ?

And how it works ?

E.g... If SNRM is below MINSNRM for longer than ??? Seconds...then

resynch the line ?



Answer From DrayTek FAE


"There are upstream and downstream MINSRNM parameter respectively, which are defined and set by the CO profile. The purpose is to retrain the modem when the target SNR margin is below min SNR margin due to the increasing noise or line condition becoming worse. The min SNR margin could affect the reboot criteria. (depend on how you set the reboot criteria)"


That means Vigor2820/CPE doesn't have MINSNRM value.

The values are defined by Co.

We just follow Co's request to reboot ADSL while the SNR margin is lower then the one defined in Co profile.

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