It reads to me like it's not a separate Wi-Fi radio on a different channel, but just an additional SSID being broadcast:
http://wifi.comcast.com/faqs.html
ctrl+f "Does the new Home Hotspot impact my Internet speeds or data usage?"



On 11.12.2014 14:55, Phil Bedard wrote:
It won't overlap with the one you are using for yourself on the same device.

DOCSIS has service flows with different priorities.  I don't know if
they are allocating specific channels for it or if it's just a
different service flow, but either way it is a lower priority and
should not cause contention with regular user traffic.

Really it is just the power they seem to be complaining about.

Phil

-----Original Message-----
From: "Harald Koch" <c...@pobox.com>
Sent: ‎12/‎10/‎2014 10:21 PM
To: "Mr Bugs" <b...@debmi.com>
Cc: "NANOG list" <nanog@nanog.org>
Subject: Re: Comcast thinks it ok to install public wifi in your house

On 10 December 2014 at 21:50, Mr Bugs <b...@debmi.com> wrote:

however they use a separate DOCSIS and 802.11 channel so if would follow
that it would be a separate IP tied to comcast corporate and not the
subscriber as well as not taking up your bandwidth.



IIRC there are only three non-overlapping channels on 802.11g and six on
802.11n; I can see more networks than that from my basement.

I haven't been keeping up with the technology, but in the ancient of days wasn't the uplink side of DOCSIS also a limited-bandwidth, shared resource?

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