 odogCable Centric Vendor BiasedPremium,VIP
join:2001-08-05
Atlanta, GA
kudos:5
 ·Comcast
| verizon has a cable network... quote:
Verizon obviously has ample capacity thanks to their FTTH network
Verizon is just using a single wavelength to deliver a standard 54-860MHz cable signal. They have the same limitation in channel capacity as Comcast assuming Comcast has a 860MHz plant. The only real difference is the single channel Comcast now has allocated to DOCSIS and the variable size of their VOD service groups. Other than that... Verizon is a standard HFC cable system piggybacking on the PON. |
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Reviews:
·Comcast
| said by odog: quote:
Verizon obviously has ample capacity thanks to their FTTH network
Verizon is just using a single wavelength to deliver a standard 54-860MHz cable signal. They have the same limitation in channel capacity as Comcast assuming Comcast has a 860MHz plant. The only real difference is the single channel Comcast now has allocated to DOCSIS and the variable size of their VOD service groups. Other than that... Verizon is a standard HFC cable system piggybacking on the PON. Besides for the obvious fact all they need to do is change the mux and they can expand the frequency range.
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"It's always funny until someone gets hurt......and then it's absolutely friggin' hysterical!" |
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Sammer
join:2005-12-22
Canonsburg, PA | reply to odog
said by odog:Verizon is just using a single wavelength to deliver a standard 54-860MHz cable signal. They have the same limitation in channel capacity as Comcast assuming Comcast has a 860MHz plant. The only real difference is the single channel Comcast now has allocated to DOCSIS and the variable size of their VOD service groups. Other than that... Verizon is a standard HFC cable system piggybacking on the PON. The digital QAM used by FiOS is strictly one way. None of that is used for upstream, phone, IP downstream etc. The EPG, VOD (like The Horror Channel) etc. that Comcast has to get in 860 MHz all use the other two wavelengths. |
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odogCable Centric Vendor BiasedPremium,VIP
join:2001-08-05
Atlanta, GA
kudos:5 Reviews:
·Comcast
1 edit | reply to BosstonesOwn
said by BosstonesOwn:said by odog: quote:
Verizon obviously has ample capacity thanks to their FTTH network
Verizon is just using a single wavelength to deliver a standard 54-860MHz cable signal. They have the same limitation in channel capacity as Comcast assuming Comcast has a 860MHz plant. The only real difference is the single channel Comcast now has allocated to DOCSIS and the variable size of their VOD service groups. Other than that... Verizon is a standard HFC cable system piggybacking on the PON. Besides for the obvious fact all they need to do is change the mux and they can expand the frequency range. Not really, the optical receiver in the ONT is likely not spec'd past 860MHz. Also very few things have 1GHZ tuners, only the newest as of yet unreleased DCX based Moto boxes have 1 gig tuners. |
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odogCable Centric Vendor BiasedPremium,VIP
join:2001-08-05
Atlanta, GA
kudos:5 Reviews:
·Comcast
1 edit | reply to Sammer
said by Sammer:said by odog:Verizon is just using a single wavelength to deliver a standard 54-860MHz cable signal. They have the same limitation in channel capacity as Comcast assuming Comcast has a 860MHz plant. The only real difference is the single channel Comcast now has allocated to DOCSIS and the variable size of their VOD service groups. Other than that... Verizon is a standard HFC cable system piggybacking on the PON. The digital QAM used by FiOS is strictly one way. None of that is used for upstream, phone, IP downstream etc. The EPG, VOD (like The Horror Channel) etc. that Comcast has to get in 860 MHz all use the other two wavelengths. notice the 54-860MHz I put in there? Thats what we like to call the forward path  I'm not sure you really understand what your even talking about. Comcast's version of the PON 1310nm wavelength is in the 5-45MHz return path, and I already spoke about the difference with DOCSIS occupying a DS channel but as I said above it uses the sub band 5-45MHz for the return.
Point is... On the forward path Verizon is using standard cable technology to deliver the video, they have the same limitations as any cable system with 860MHz of bandwidth.(minus DOCSIS and the variable VOD service group sizing used by both companies..) |
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 a333A hot cup of integrals please
join:2007-06-12
Rego Park, NY
 ·Cingular Wireless
1 edit | er, isnt Comcast's 860 Mhz 'downstream channel' split up among IP downstream, and phone, and VOD, besides actual video?
As far as I know, FiOS only uses the 860 Mhz for pure video and HD channels. VOD goes on the IP downlink aka the 622 Mbits/sec (2.4 Gbits/sec on GPON yay) channel. Same goes for IP aka HSI.
Correct me if I'm wrong |
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Reviews:
·Comcast
| reply to odog
Take a look at the gpon spec ont. They offer the ability to go upto 1.2g. Although not much can tune that high , it is still available.
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"It's always funny until someone gets hurt......and then it's absolutely friggin' hysterical!" |
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odogCable Centric Vendor BiasedPremium,VIP
join:2001-08-05
Atlanta, GA
kudos:5 Reviews:
·Comcast
| said by BosstonesOwn:Take a look at the gpon spec ont. They offer the ability to go upto 1.2g. Although not much can tune that high , it is still available. Look on the spec's for the ONT's the GPON spec is irrelevant if none of the gear adheres to said standard. |
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Reviews:
·Comcast
| The gear they use has the ability to be network flashed to allow it to range to 1.2 g again look at the ont's they use and the spec sheet. It's field upgradeable for the future.
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"It's always funny until someone gets hurt......and then it's absolutely friggin' hysterical!" |
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odogCable Centric Vendor BiasedPremium,VIP
join:2001-08-05
Atlanta, GA
kudos:5 Reviews:
·Comcast
| said by BosstonesOwn:The gear they use has the ability to be network flashed to allow it to range to 1.2 g again look at the ont's they use and the spec sheet. It's field upgradeable for the future. Umm.... you can't flash an APD into having a higher receive window, or an flash an AMP into having a higher effective range. In other words you can't flash a piece of hardware past it's native hardware limitations. |
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Reviews:
·Comcast
| first off the hardware they use has a range of 1.2g at the moment there is no firmware to take care of the ability in the hardware.
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"It's always funny until someone gets hurt......and then it's absolutely friggin' hysterical!" |
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