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FIOS TV pixellation fix - attenuate to SNR 31

Discussion in 'TiVo Series3 HDTV DVRs' started by AbMagFab, Nov 19, 2007.

  1. Sep 9, 2008 #301 of 866
    lrhorer

    lrhorer Active Member

    6,924
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    Aug 31, 2003
    San...
    Um, well sort of. The upstream signals for broadband service and 2-way services are modulated into a LASER at the ONT, but the LASER which produces the signals for his TV reception is back at the headend.
     
  2. Sep 9, 2008 #302 of 866
    lrhorer

    lrhorer Active Member

    6,924
    0
    Aug 31, 2003
    San...
    That's a 2.1Ghz diplexer. It won't help at all. You need a diplexer or Low Pass Filter with a cutoff around 900MHz. Much higher than that and it won't attenuate the MOCA carrier. Much lower and you'll lose some channels.
     
  3. Sep 9, 2008 #303 of 866
    webin

    webin New Member

    307
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    Feb 13, 2008
    Hillsboro,...
    You DID read the post where I said it didn't help, right? In all actuality, now that you bring it up, I'm not sure that the one I bought was 2.1ghz or 900mhz. If I did buy the 2.1ghz version, it's definitely an oversight on my part, but there's no real need to rehash it.
     
  4. Sep 9, 2008 #304 of 866
    lrhorer

    lrhorer Active Member

    6,924
    0
    Aug 31, 2003
    San...
    Yes, I read it. My point was it never had a chance of helping. A 900MHz diplexer with the high pass port properly terminated, or an 850 - 1000MHz low pass filter will eliminate any spurious signals above 1000MHz (like the MOCA carrier). This in turn can help eliminate pixelization in the Tivo, but ony if the MOCA carrier is part of the problem being experienced by the user at hand.
     
  5. Phantom Gremlin

    Phantom Gremlin New Member

    1,555
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    Jun 20, 2002
    Tualatin,...
    Ha. Wishful thinking. The TiVo HD tuners are, in my opinion, a P.O.S. I define P.O.S. as meaning "far inferior to the tuners in cable company STBs". Just look at all the complaints. These forums would be far quieter if the tuners were up to snuff.

    Personally, I only have anecdotal evidence of this. But in my case my TiVo HD was very flaky with input of -9dBmV, began working robustly when I added a +15dB amp. Of course, cable company boxes work fine in my house without needing distribution amps.

    Unfortunately the only "signal strength meter" I have is the status page in my Motorola cable modem. So the great caveat with my single-data-point anecdote is that the signal strength of the Internet I receive is "about the same" as the video channels.
     
  6. david(dallas)

    david(dallas) New Member

    157
    0
    Sep 29, 2003
    I have had my TIVO w/cable card for over 1 month and I just started seeing this issue on a few local network channels. Problem doesn't exist on the Fiso receiver. My number if 37ish.
    My question is would this be my problem if it just started happening or would I have had this problem since day one.
    I guess I can try this fix and go from there.
    If it doesn't fix it, what next, Call TIVO or Verison FISO?
     
  7. webin

    webin New Member

    307
    0
    Feb 13, 2008
    Hillsboro,...
    If you try the attenuators, and are unhappy with the results, I think your next step should be to contact verzion "fios", and ask if a tech could come out to help you troubleshoot.... make sure you know whether or not they will charge you a service fee for the visit.
     
  8. Gregor

    Gregor Active Member

    46,758
    15
    Feb 18, 2002
    Noticed some 'weirdness' while doing some testing today.

    I put the 4002IFD diplexer on yesterday and didn't notice much (if any) improvement while watching ABC yesterday, so this morning I took it off and decided to try a bunch of different attenuators and log the results

    Code:
    
    
    channel 514 (ABC, 519000kHz)
    
    Att  SigStrn  SNR
    0     90/100  36
    20    50      28
    10    86/90   34
    16    68      31
    13    77      32  
    3     100      36
    
    
    I then set the attenuation to 13 and started flipping through the HD channels.

    When I got to channel 866, SHOWHDP (183000 kHz), it would not display. I could only get the channel to display at 0 or 3 attenuation, where the SS was 100 and the SNR 36.

    Even at 6 attenuation, I get a black screen.

    It's on the same tuner, and has a similar SS when unattenuated, so why won't the channel display at a similar attenuation?
     
  9. sinanju

    sinanju Member

    654
    1
    Jan 3, 2005
    I had FiOS installed Thursday. I mentioned this issue to the installer and he left a handful of attenuators with me. Last night I noticed one of my SD channels pixelating. So I popped a 6dB on and all is right with the world. I'm not down to a S/N of 31dB... more like 34-35... but that one bad channel is now experiencing no errors.

    I have none of their equipment except the CableCARDs and I insisted on using my own router, so there's no MOCA to deal with.

    EDIT:

    Not all is right with the world... more below...
     
  10. Dmon4u

    Dmon4u Unresponsive User

    2,163
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    Jul 15, 2000
    PA
  11. cuyahoga

    cuyahoga New Member

    104
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    Nov 15, 2002
    Warwick...
    You were able to pull this off?

    Its exactly what I'd like to do. The use of their router is what was holding me back from making the switch.

    Any magic words I need to say in order to make this happen?
     
  12. sinanju

    sinanju Member

    654
    1
    Jan 3, 2005
    "I'm not using your router; I don't need it because I have none of your equipment besides CableCARDs... nothing requires MOCA"

    They'll have to reconfigure the ONT for ethernet, but it's perfectly doable.
     
  13. webin

    webin New Member

    307
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    Feb 13, 2008
    Hillsboro,...

    It sounds like you may be a bit of a technical guy (based on the fact you show disdain for the actiontec router). They provide their router for free, but if you have your own available and ready when the tech arrives (and you know how to access and configure it), I'm fairly certain the tech will let you and maybe help you get things up and running with your own equipment instead of theirs. It's also possible to make configuration changes yourself after the fact (you'll need to scrape these forums for posts about using your own router). You'll likely need to make a call to the Fiber Solutions Center with information (MAC address) of your router. This also assumes you have an ethernet cable running from the ONT to your router for ethernet, and coax from ONT to TV for... TV.

    I was running my internet over moca for a while, but switched it to an existing ethernet cable (from an old pre-tv configuration). After plugging the ethernet into the ONT, I reset my router and called FSC. They turned moca off on the ONT and turned on ethernet, and I was up and running again. I could swap out their actiontec for my old linksys and make a similar call.

    I'm rambling. Sorry about it.
     
  14. cuyahoga

    cuyahoga New Member

    104
    0
    Nov 15, 2002
    Warwick...
    No, feel free to ramble away! Both you and sinanju have very helpful ramblings.

    So, the ONT will tie into my existing coax for the TiVOs and Verizon can be convinced to run CAT-5 (or whatever category ethernet they like) into my existing router from the ONT for network.

    Nice.
     
  15. sinanju

    sinanju Member

    654
    1
    Jan 3, 2005
    When I did a renovation, I had the electrician run power, coax, phone, and two CAT 5e ports to the space under my stairs. When I had Comcast and Vonage, the Vonage box pluged into the house phone wiring with a simple patch cable. The coax ran to the cable modem. The ethernet ports were connected to the router, also under the stairs, and ran to the office and the entertainment center for the TiVo.

    Now that I have the ONT from FiOS, the phone patch cable runs from the house port to it instead of the Vonage box. The coax was turned around on the splitter in the cellar so the space under the stairs is the input to the system rather one of the outputs (since the cable modem is now out of business), and the ethernet comes directly from the ONT to the router.
     
  16. sinanju

    sinanju Member

    654
    1
    Jan 3, 2005
    I'm getting corrected errors along with the occasional rash of uncorrected errors resulting in pixelation on the HD channels that share QAMs at 111, 117, and 123 MHz. On rare occasions 135 MHz experiences it, too. 123 is the most likely to lapse into pixelation. With the exception of the pixelation storms, the channels on 123 MHz seem to tick along at an average of 3 corrected errors/second with none uncorrected, though the count does not increment steadily.

    The attenuation fix has already been applied -- the Verizon tech actually spent a while getting things just right. MOCA is not enabled on the ONT and I double-checked that the light is off. All other channels are rock solid. I've raised and lowered the temperature of the unit by a full degree on either side of the common operating temperature and it doesn't seem to be related.

    Verizon is still looking into things, but I was curious to know if anyone else had an idea.
     
  17. rocko

    rocko Cuckoo for TiVo

    1,551
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    Oct 29, 2002
    Northeast...
    Here's a question. Do we actually know for a fact that enabling the ethernet port on the ONT prevents MoCA traffic on the coax feed? Or am I just making an assumption that it might work that way?

    If the main reason to use the ethernet port on the ONT is to 86 the Craptiontec that's all well and good. I ask since I, and lots of other apparently, find MoCA to be a good thing seeing that we use NIMs to provide wired ethernet to locations where we don't/can't have CAT5/6 runs.

    Others who are having problems with their S3's due to MoCA chatter might be interested as well - they might think that they're taking MoCA out of play by losing the Actiontec when in actuality the MoCA is still there.
     
  18. sinanju

    sinanju Member

    654
    1
    Jan 3, 2005
    I think that seeing the MoCA light out on the ONT is a good way to know it's dead.
     
  19. rocko

    rocko Cuckoo for TiVo

    1,551
    0
    Oct 29, 2002
    Northeast...
    And is your (or anyone's) MoCA light out ?
     
  20. webin

    webin New Member

    307
    0
    Feb 13, 2008
    Hillsboro,...
    My moca light is out because I specifically set up the ethernet connection to provide internet service, called Verizon, and had the Moca turned off. I also disconnected the run of coax that was going to my actiontec.

    It had no noticeable influence on my pixellation.
     

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