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SDV FAQ

Discussion in 'TiVo Series3 HDTV DVRs' started by bdraw, Jul 3, 2007.

  1. Aug 30, 2007 #261 of 2401
    ah30k

    ah30k Active Member

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    Any channel with inactivity for a period of time is able to be polled to see if the watcher is still there. "Please hit the enter button if you still want this channel". If no response is received the channel will be reclaimed and the STB will be sent to a safe channel.


    oh, and getting up at 4:00 to set a channels seems like an awful lot of work.
     
  2. Aug 30, 2007 #262 of 2401
    ah30k

    ah30k Active Member

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    Current systems usually have PPV and linear channels separate. Future systems will mix and match for greater efficiency.
     
  3. Aug 30, 2007 #263 of 2401
    wbertram

    wbertram Member

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    If they do as you suggest, then the "SDV pool of channels" would have to be essential the same as the advertised number of available channels. So, what has SDV bought them? Nothing!

    With regards to the "compression fix". You would be happy watching highly compressed channels? ala the HD Lite used by the satellite companies?
     
  4. Aug 30, 2007 #264 of 2401
    vman41

    vman41 Omega Consumer

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    If the buildout of the fiber is deep enough to have just 10 outlets in a switch group, you'd be the 10th person so could always get what you want.

    The number I seem to be seeing is 400-500 subscribers being served by a hub, and I guess 300 or so Mhz of SDV bandwidth (both SD and HD). If all HD, that would be 100-150 channels.
     
  5. Aug 30, 2007 #265 of 2401
    wbertram

    wbertram Member

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    If I get up to get a beer during a commercial, I might get "polled", and when I come back, I will have lost the channel in the middle of a show? That will make customers very happy!
     
  6. Aug 30, 2007 #266 of 2401
    ah30k

    ah30k Active Member

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    Statistical analysis shows that if you offer an x channel pool for y offerings with a node size of z you will be able to satisfy all of the users 99.9% of the time. The x can be much less than y. You can choose not to believe it if you want.
    Most users would never notice the difference and it would rarely happen anyway. Once again, you can choose to disagree if you want.
     
  7. Aug 30, 2007 #267 of 2401
    ah30k

    ah30k Active Member

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    The timeout for the response is configurable and will surely be tuned to allow people to take a piss. Again, this message will only pop up if you have done nothing with the STB for a long period of time. So if you are in the corner case of someone who has done 'nothing' with your remote for a long time, and you are still watching a show, and you get up for a beer at just the right time and you take a very long time to get back THEN your worry might be valid.
     
  8. Aug 30, 2007 #268 of 2401
    ah30k

    ah30k Active Member

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    Some people seem to think that those designing these SDV systems are total buffoons.

    They are spending a lot of time engineering it.
     
  9. Aug 30, 2007 #269 of 2401
    CharlesH

    CharlesH Member

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    Aug 29, 2002
    Sacramento...
    Kind of like when you are watching something in the middle of the 30-minute "live" buffer, and your TiVo prompts you to change channels to record something, and discards the rest of the buffer if you don't respond in time. :)
     
  10. Aug 30, 2007 #270 of 2401
    wbertram

    wbertram Member

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    Jun 14, 2002
    Put some realistic numbers for x, y, and z in the appropriate formulas, and let us see what the probability is that I will not be able to receive a random channel selection when I want to. Try it with the appropriate numbers for, say, TWC in Austin.

    Poll the SDV users in Austin and see how often they are getting the "Channel Not Available" screen.
     
  11. Aug 30, 2007 #271 of 2401
    txagfan

    txagfan New Member

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    Jul 30, 2007
    Texas
    The only time I have seen that screen is when a channel is down due to a service outage. Otherwise, I have never seen that screen.
     
  12. Aug 30, 2007 #272 of 2401
    ChrisFix

    ChrisFix New Member

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    Jul 31, 2007
    Chapel Hill, NC
    This is exactly how the public telephone system works...there are many less channels for completing calls than there are subscribers - depending on telco, and where in the network you are, they concentrate up to 5:1 (one voice channel for 5 subscribers) and it works 99.9% of the time for 100% of subscribers.
     
  13. Aug 30, 2007 #273 of 2401
    ah30k

    ah30k Active Member

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    Sorry, no can do. Not public data.

    Why are you telling me to go do something. You're welcome to if you wish.
     
  14. Aug 30, 2007 #274 of 2401
    wbertram

    wbertram Member

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    Jun 14, 2002
    And what about my kids who are watching a children's show, and don't understand the message on the screen? "Daddy, Daddy, my show went off and won't come back! sob, sob, sob".
     
  15. Aug 30, 2007 #275 of 2401
    LoREvanescence

    LoREvanescence Always Autocorrected

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    Salem, MA

    What would happen though, if you have a dvr stb forsay, and are not home while it's recording. If it were to get polled while recording event could the station get pulled? Just a interesting thought.
     
  16. Aug 30, 2007 #276 of 2401
    ah30k

    ah30k Active Member

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    You are moving into the realm of irrational argumenting now. For those looking to argue against it, nothing will convince you. I already said 1) it should not even be statistically needed 2) it will only go to STBs with long periods of inactivity. If you kids fall into both then tough luck. **** happens.
     
  17. Aug 30, 2007 #277 of 2401
    ah30k

    ah30k Active Member

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    Once again, the engineers are working many use-cases. STBs with recordings are assumed to be using the channel and will not be polled.
     
  18. Aug 30, 2007 #278 of 2401
    wbertram

    wbertram Member

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    The only way you can guarantee 99.9% availability is if the channel pool, x, is equal to, or slightly less than, the lesser of the number of offerings, y, or the node size, z. Since y is most likely less than z, this means that x must be equal to, or slightly less than y. In other words, the size of the channel pool must be very close to the number of offerings. So what has the expense of the SDV equipment bought you?
     
  19. Aug 30, 2007 #279 of 2401
    ah30k

    ah30k Active Member

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    Sorry, can't argue with you any more on this. You are right. All of the cable operators are stupid and pissing millions away on this with no payback.
     
  20. Aug 30, 2007 #280 of 2401
    vman41

    vman41 Omega Consumer

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    The smarter thing to do would make the protocol that requests the channel include the expected time on that channel. Alternatively, an STB making a recording could just renew the channel request every 15 minutes.
     

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