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pre-equalization + load-balancing = modem d2 rebooting

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derytelecom
pre-equalization + load-balancing = modem d2 rebooting

Hi

We recently started testing the pre-equalization in our cisco ubr10k

The SNR increase in some case was very good

But after a couple of days we started getting complains from customers that their modems were resetting

In all cases these were docsis 2 modems

We disabled the load-balancing feature and the trouble went away

We re-enable load-balancing and the trouble came back

We disabled pre-equalization and the trouble went away

Our guess is that when a modem changes upstream frequency the pre-equalization process fails for some reason and the modem just resets

have you ever seen this problem ?

is this a known fact ?

I read that a modem could lose some packets while doing the pre-eq after load-balancing but not going offline

Thanks

Patrick

mbowe
Some D2 modems on very old

Some D2 modems on very old firmware do not like pre-eq

What model modems are having problems, and what firmware do they have ?

If the firmware is old you can try pushing out updates

If you dont have access to updated firmware you can add config on the cmts to exclude these particular mac prefixes from pre-eq

derytelecom
Hi

Hi

for now we have seen this on arris cm550a

I have already asked arris for a firmware update

Il will look to exclude them on our next test

thanks