[opendtv] Re: Digital Better Than Analog?


On Jul 30, 2007, at Monday, July 30, 20077:06 PM, johnwillkie wrote:

What’s wrong with this calculation?
What's wrong with the calculation, from the info I've been able to gather, is that you're mistakenly thinking that the FIOS internet and TV services are sharing the same allocated bandwidth to the home. They are not. 

http://arstechnica.com/news.ars/post/20060202-6104.html
"In short, there's almost no cause for concern that Verizon's own traffic will relegate other services to the dark alleys of the Fios network. The video is actually being delivered on a separate wavelength from the other services. According to Sirbu, roughly 3.5Gbps of the network's capacity will be allocated for downstream video. That leaves 620Mbps of bandwidth for 'Net traffic, which is split up between the 32 users on each Broadband Passive Optical Network node. Once Verizon switches to Gigabit PON, that number will rise to 2.4Gbps. Video on demand will be delivered via IPTV." 

and, from this page:

http://blogs.zdnet.com/Ou/?p=571&page=2
"The most important aspect of FiOS is its massive bandwidth capacity. The current implementation of FiOS uses a technology called BPON (Broadband Passive Optical Networking) which offers 622 mbps of total down-stream and 155 mbps up-stream bandwidth split amongst 32 homes for Internet access and the current premium FiOS Internet service caps users to 50 mbps down-stream for burst speed. FiOS TV broadcasts come over a separate wavelength using a technology called GPON (Gigabit Passive Optical Networking) which supports 2.4 gbps down and 1.2 gbps up. Since it’s a broadcast technology, the downstream doesn’t have to be split amongst 32 homes so it can offer a massive number of high-quality video broadcasts to every home. Video-on-demand on the other hand requires a unicast technology and that’s delivered using IPTV technology over the BPON data channels."

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