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Official Time Warner Cable Thread

Discussion in 'TiVo Series3 HDTV DVRs' started by tunnelengineer, Sep 14, 2006.

  1. Jan 7, 2013 #5701 of 6277
    cwoody222

    cwoody222 Active Member

    11,132
    1
    Nov 13, 1999
    Buffalo, NY
    When I ordered Showtime I lost some channels until they fixed it.

    Some idiot borked up your account by trying to add things. A tech visit or a new adapter ain't gonna fix it.

    Call 'em back and try to get someone competent.
     
  2. Jan 7, 2013 #5702 of 6277
    cwoody222

    cwoody222 Active Member

    11,132
    1
    Nov 13, 1999
    Buffalo, NY
    You are correct. All TWC markets do this.

    You will be limited to only transferring your local broadcast channels. It sucks :(
     
  3. Jan 7, 2013 #5703 of 6277
    Welshdog

    Welshdog Tivo this, punk!

    310
    0
    Jan 3, 2005
    Austin, TX
    This does seem to be the likely source of your trouble. Either the splitter is inadequate or the cable outlet you moved to has an issue. One thing I have seen in home video cables and cables where I work (video post production) is that a single strand of the shielding braid can sometime get caught in the connector and can even touch the center conductor. With analog it usually will work anyway even though the signal will be degraded. With digital it will not work. In fact digital is very sensitive to this and many other things like cable kinking. For digital to work, your cabling has to be perfect.

    EDIT: In fact I am upgrading some of my wire and devices in anticipation of going digital/cablecard. I added an Electroline Drop Amp (unity gain because my runs are not very long). It passes all signals (digital and analog) in both directions. http://www.electroline.com/product_EDA_UG.php Also making sure the cables I have are properly terminated and are good quality RG-6.

    I have concerns about an outdoor splitter TWC put in years ago when I got Roadrunner. If I have problems when I get the Cablecard I'll have the option of removing the splitter and using the Electroline to split off the various TV cables and the cable modem line without any losses.
     
  4. Jan 7, 2013 #5704 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    Any time you change something on the coax wiring, you risk causing a signal quality problem that TA's are sensitive to. Putting a splitter in divides the signal strength, adds new connections that if not done well add noise. Go to the TA diagnostic page and check the FDC and SNR levels. FDC should be no more than +/- 10 (closer to 0 the better) and RDC should over 30.
     
  5. Jan 7, 2013 #5705 of 6277
    smoberly

    smoberly Member

    370
    0
    Jul 6, 2004
    Plano, TX
    got it...I'll do it.

    Thanks.
     
  6. Jan 7, 2013 #5706 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    Just to clarify which FDC and RDC stat...
    FDC +/-10 dBmV (closer to 0 the better)
    RDC over 30 dBmV
     
  7. Jan 7, 2013 #5707 of 6277
    smoberly

    smoberly Member

    370
    0
    Jul 6, 2004
    Plano, TX
    okay...I didn't find RDC, and there ARE TWO fdc'S...here is what the screen says:

    Downstream status, OOB Freq: 75.250 MHz, carrier lock: yes, SNR 17dB fair, data:yes, hunt mode: none

    inband freq: 693.000 MHz QAM256, carrier lock: yes, SNR 32 dB Good
     
  8. Jan 8, 2013 #5708 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    What model TA do you have? These are the TA diag pages from my Cisco STA1520
    [​IMG]
    [​IMG]
     

    Attached Files:

  9. Jan 8, 2013 #5709 of 6277
    smoberly

    smoberly Member

    370
    0
    Jul 6, 2004
    Plano, TX
    I don't recognize that screen...will have to check when I get home later today...Time Warner scheduled for a 4:00 appointment this afternoon...let's hope they can resolve this.
     
  10. Jan 8, 2013 #5710 of 6277
    smoberly

    smoberly Member

    370
    0
    Jul 6, 2004
    Plano, TX
    My TA's are Motorola....
     
  11. Jan 8, 2013 #5711 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    Well, them's shoes of a different sort. Not sure if the Motorola equipment operates the same way or has the same signal specs.
     
  12. Jan 9, 2013 #5712 of 6277
    dlfl

    dlfl Cranky old novice

    6,998
    18
    Jul 6, 2006
    Near...
    On a Cisco system at least, both these SNR's would be on the low side. My OOB SNR is typically 26 dB and inband QAM256 (i.e., a tuned channel) SNR is typically in the 34+ dB range.

    Measure the signal strengths for some channels. I suspect they will be on the low side (i.e., below 75).
     
  13. Jan 9, 2013 #5713 of 6277
    smoberly

    smoberly Member

    370
    0
    Jul 6, 2004
    Plano, TX
    so what exactly does the SNR tell me?
     
  14. Jan 9, 2013 #5714 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    SNR (and S/N on Cisco) is the signal to noise ratio. It's recommended to be higher than 30 dB. SNR of 17 dB is too low. Could be from low signal level due to too many splits or high noise level due to bad cable or connectors. Did cable tech not find anything yesterday?
     
  15. Jan 9, 2013 #5715 of 6277
    smoberly

    smoberly Member

    370
    0
    Jul 6, 2004
    Plano, TX
    he no-showed....very frustrating...I spent an hour on the phone last night..when setting the appointment, I had asked them to do the appointment pre-call to my cell phone because my plan was to just leave the office and head home when he called....well, he called my home number instead...no one was there, so they cancelled the appointment.

    After an hour, being transferred seven times, and receiving no satisfaction, I finally got to the retention/cancellation group....we are re-scheduled for this afternoon.

    More to follow.....
     
  16. Jan 9, 2013 #5716 of 6277
    SCSIRAID

    SCSIRAID Active Member

    2,321
    0
    Feb 2, 2003
    Vero Beach, FL
    Acceptable SNR differs with modulation type. 30+ is required for QAM256 but the OOB channel is QAM64 which requires less SNR.
     
  17. Jan 9, 2013 #5717 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    I think QAM64 still needs SNR over 24 dB maybe.
     
  18. Jan 9, 2013 #5718 of 6277
    SCSIRAID

    SCSIRAID Active Member

    2,321
    0
    Feb 2, 2003
    Vero Beach, FL
    I dont know the actual value needed... but QAM64 can definitely cope with quite a bit more noise than QAM256 and thus can operate at a much lower SNR than QAM256..... BUT... In the same cable system, I wouldnt expect such large delta between the FDC and the channel you are trying to watch. With my TA, the SNR delta between FDC and watched channel is about 5db (33db FDC vs 38db RDC) as measured by the TA. The signal level is 5dBmV different (-4dBmV vs 1dBmV). To have a 25db SNR difference means the FDC is at a pretty low level in comparison with the active channel (which is also showing a questionable SNR of 32db).


    Page 14 shows a table with error probabilities for both schemes at various SNR's. It shows 24db SNR as pretty much sucking for both schemes. At 30db SNR, it shows QAM64 as having 8 orders of magnitude better error probabilities than QAM256.

    http://docsis.beckitrue.com/documents/sunrise/QAM_Impairment_Effects_on_MER_BER_104.pdf

    lrhorer could do this subject more justice than I could.

    EDIT: Found another reference to acceptable SNR's..

    http://www.dslreports.com/faq/5862

    QPSK: 12 dB minimum. 15 dB or higher recommended. (often used in upstream channels)
    16 QAM: 18 dB minimum. 21 dB or higher recommended. (often used in upstream channels)
    64 QAM: 24 dB minimum. 27 dB or higher recommended. (often used in downstream channels)
    256 QAM: 30 dB minimum. 33 dB or higher recommended. (often used in downstream channels)
     
  19. Jan 9, 2013 #5719 of 6277
    scole250

    scole250 Member

    807
    5
    Nov 8, 2005
    Goldsboro, NC
    So do you think smoberly's issue is due to poor signal or too much noise or something else?
     
  20. Jan 9, 2013 #5720 of 6277
    SCSIRAID

    SCSIRAID Active Member

    2,321
    0
    Feb 2, 2003
    Vero Beach, FL
    I think he has a poor signal problem. Low overall level with too much negative tilt. Bad cable, bad splitter etc etc.

    However, that may not be the only problem there is. TA's and Cablecards are notorious for issues leading from cableco account configuration problems... (improperly balanced or configured accounts etc). Since TWC is mostly Cisco based and that is what is typically discussed here, I dont know if Moto based systems have the same kind of issues. That said... the first thing I would do is clean up the signal and get the SNR's up to snuff. Then I would reinitialize the account and re-hit the boxes and see what results.
     

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