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New MB8600 Modem (on approved list) Now Says "Incompatible Base On Filters"

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New MB8600 Modem (on approved list) Now Says "Incompatible Base On Filters"

The above title says it all.  The internet service is going in and out every 20 minutes or so for about 5 minutes.  This is extremely annoying and I am going to just cancel my service.  I am infinitely better off on the T-Moble LTE network which does sometimes go as low as 2Mbsp down and 1 up -- but works 99.9% of the time.  Usually, it is comparable to my comcast plan 10/2.5.  I am not a gamer, etc., I don't need globs of bandwidth which is part of the frustration -- I can get by with almost any service (used 3/1 for years).  Chanel 1 does look too high at 663 (and it's misnumbered as 27 -- also note this caused a displacement such that Ch 2 is labeled 1; Ch 3 is 2, etc.  Chs. 28 and 29 are just dead


   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (d Corrected Uncorrected
1 Locked QAM256 27 663.0 12.1 42.1 4668 1427
2 Locked QAM256 1 501.0 12.1 42.2 158452 41468
3 Locked QAM256 2 507.0 12.0 42.0 166657 38814
4 Locked QAM256 3 513.0 11.9 41.9 161949 37311


As you can see Ch 29 (really #30) is just dead:

29 Locked OFDM PLC 29 693.0 12.3 40.8 0 0


Any help would be appriciated -- and it will prevent you from losing a 20+ year customer.




Re: New MB8600 Modem (on approved list) Now Says "Incompatible Base On Filters"

hi, I moved your post to the home networking area of the forum.

I am not a Comcast Employee.
I am just a customer, volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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Diamond Problem Solver

Re: New MB8600 Modem (on approved list) Now Says "Incompatible Base On Filters"

Unless you are subscribed to their "Gigabit" speed tier, that DOCSIS 3.1 (OFDM) channel may not be passing any data. And there is nothing wrong with the channel frequencies or the channel ID designations of the channels that you posted. You are reading something in to nothing concerning that. Are there any more downstream channels being indicated ? What about the upstream channel signal stat figures ? It appears that you haven't posted them.


BTW, the downstream power level figures so far are pretty hot (high) and may need to be reduced.