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Thinkdiff
Premium,MVM
join:2001-08-07
Bronx, NY
kudos:11
reply to PJL

Re: [HD] Is Verizon lying about HD?

Just to make this point even clearer - FiOS TV utilizes an RF to fiber to RF conversion. At the FiOS headend, they basically run a regular CableTV system that has ~864MHz bandwidth split into 6MHz QAM channels. That RF signal is modulated onto one single wavelength in the fiber and demodulated into RF in your ONT. This is the same technique used by cable companies that run HFC networks (local fiber nodes convert fiber to coax for 200-300 homes), which is pretty much all of them.

The benefit is FiOS used to offer analog TV service, it works with industry standard set top boxes, and it works with QAM tuners and CableCARDs. Verizon didn't have to recreate anything - they can just reuse. The downside is FiOS has the same restrictions/limitations on capacity that cable companies do. The upside is they don't need to waste space on analog or DOCSIS Channels (for cable modem), so they can get away with 2 HD channels per QAM and claim they don't recompress anything.
--
University of Southern California - Fight On!

hubrisnxs

join:2009-12-30
Fountain Valley, CA
kudos:3
QAM is the correct answer, it's still the limiting factor,.