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OOB SNR. How low is too low?

Discussion in 'TiVo Series3 HDTV DVRs' started by morac, Apr 18, 2008.

  1. morac

    morac Cat God

    9,412
    130
    Mar 14, 2003
    NJ
    Recently I've noticed the the SNR on the OOB frequency for one of my cards is getting pretty low (around 17 dB at the lowest). My cable box uses the same frequency for it's OOB communication and it is ever lower than my TiVo (15 dB which it reports as poor).

    Everything seems to be working and my picture is fine as is my Internet and CDV so it just seems to be that frequency.

    Does anyone know how low of a SNR the OOB channel can be and still work reliably?
     
  2. litkaj

    litkaj Member

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    Jun 5, 2007
    Exton, PA
    With all the attenuators sitting on the back of my S3 (FiOS TV) my OOB drops to 15-16 but it always has an OOB signal lock.
     
  3. cableguy763

    cableguy763 New Member

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    Oct 29, 2006
    Austin
    The OOB is your forward data carrier and is more than likely using QPSK modulation. QPSK is much more robust than QAM and can be much closer to the noise floor. If your box is working, you shouldn't worry. If it was affecting the box or tivo, the cable box would probably take a really long time to boot (if at all), the cards could lose their channels maps and emm's, and the box could lose guide data.
     
  4. ilh

    ilh New Member

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    0
    Dec 21, 2007
    BTW, I think OOB lock time might be a decent approximation to time since last reboot.
     
  5. morac

    morac Cat God

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    130
    Mar 14, 2003
    NJ
    Or the last time your cable went out. ;)
     

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