TiVo, MOCA, and Comcast XB3 Modem

Discussion in 'TiVo Coffee House - TiVo Discussion' started by PSU_Sudzi, Oct 24, 2015.

  1. krkaufman

    krkaufman TDL shepherd

    Nov 25, 2003


    Ah, there you go. Your fu is strong.
    We're getting off-topic, since the issue at hand strictly relates to Comcast & TiVo, but trying to use many of those other bands would be problematic on coax lines also carrying cable TV/Internet signals (and simply isn't possible for the specific hardware in question, getting back to Comcast & TiVo).


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  2. HarperVision

    HarperVision TiVo's Italian Cuz!

    May 14, 2007

    I'm hoping your "fu" means "follow-up", and not the other meaning that's been thrown at me on numerous occasions! :p
  3. jgorran

    jgorran New Member

    Nov 3, 2013
    KR Kaufman,

    You described my situation correctly. I only suffered through interference that effected both the Tivo Roamio Plus and the Mini when I attached the Xfinity Companion Box (which also tended to freeze up) to the coax network. While I never tried to play with filters, I did go a little deeper into the Moca network frequency used by my Actiontec and was able to change it six weeks ago. However, as you can see, it did not do the trick. Only removing the Xfinity Companion Box did. Again, I am satisfied with the final results.
  4. fcfc2

    fcfc2 Well-Known Member

    Feb 19, 2015
    Hi guys,
    A couple of things, one if using MoCA 1.0 or 1.1 equipment, you can create and operate at least 2 different simultaneous MoCA networks by using different and fixed MoCA channels in the D band but you must have each connected to your router/switch on one of the units.
    MoCA 2.0 uses groups of adjoining channels, 4 I believe, to get the higher throughput and the 2.0 standard also includes the possible use of an "extended" D band up to 1675MGz and in theory there is room to allow for up to 2 MoCA 2.0 networks to exist on the same coax.
    When Verizon Fios was still back on MoCA 1.0 they would sometimes run out of MoCA "slots" on one network for customers with more than 8 TV's and would setup a second one with a separate MoCA 1.0 adapter (NIM 100) and set a different MoCA channel for some boxes to use.
    Comcast's system is a bit of a mystery to me and I have been unable to get accurate and reliable information. I have read that some, possibly the newer versions of the xfinity TV/DVR equipment, actual have a "modem" of their own and separate MoCA system to connect to their satellite boxes but I don't know if this is accurate information.
    I know that when their MoCA gateways are used, it is the MoCA 2.0 standard and apparently these gateways are setup to be the MoCA "network controller".
    What exactly is going on with jgorran's system when he connects the xfinity satellite box is puzzling to say the least, it is possible that the connection of that device triggers something on their DVR to become the "network controller" which then creates a conflict with the existing "network controller" and crashes the system. It is impossible to say with the limited information available.
    There are several ways MoCA can be implemented on a device, as a "network controller", as a bi-directional device which can also "act as" a "network controller", and a receiver without the ability to become a network controller, aka the mini. Most adapters are in the 2nd category, but some few like the branded WCB3000N's are set to become the "network controller", which is why I believe they are also one the few devices which will force a MoCA 2.0 entire network down to MoCA 1.1 speeds.
    krkaufman likes this.
  5. jgorran

    jgorran New Member

    Nov 3, 2013


    Don't you all just love technology? That response from fcfc2 convinces me that as long as my current configuration "works", I will not chance screwing it up by attempting to change ANYTHING ELSE. Thanks for the discussion. I did learn more than I previously knew.

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