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av3

join:2002-03-20
Gaithersburg, MD
reply to av3

Re: If I just get FiOS TV do I still need a broadband router?

So the difference between a Comcast DVR and a FiOS DVR is that the Comcast ones have a built-in broadband modem so they can talk directly on the coax to Comcast servers for guide and on demand? I wonder why FiOS didn't do it this way too?



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

said by av3:

So the difference between a Comcast DVR and a FiOS DVR is that the Comcast ones have a built-in broadband modem so they can talk directly on the coax to Comcast servers for guide and on demand? I wonder why FiOS didn't do it this way too?

It's most likely less cost effective. It would require another wavelength of light for the RF upstream channels, some method of multiplexing/demuxing the upstream/downstream RF channels onto and off of the Coax, a modulation scheme to time multiplex the data going onto the upstream wavelength so only one ONT is sending at a time, and then corresponding equipment on Verizon's side to do the reverse.

They could've taken DirecTV's approach and send the guide data on subchannels at all times and have the box periodically update from that stream, but then VOD still needs a return channel. DTV used to use a phone line for PPV.. and who wants to do that anymore? Not to mention that VOD would then take up QAM slots on the coax, where Verizon is already very limited due to their high picture quality.

They already have a dedicated, very high bandwidth channel for data and their internet service. Why not just use that?
--
University of Southern California - Fight On!


Zero

join:2009-07-01
Collegeville, PA
reply to av3

said by av3:

So the difference between a Comcast DVR and a FiOS DVR is that the Comcast ones have a built-in broadband modem so they can talk directly on the coax to Comcast servers for guide and on demand? I wonder why FiOS didn't do it this way too?

Not quite. Comcast relies solely on QAM (coax) to distribute all of its services. They set aside and reserve ranges of QAM frequencies for dedicated use for broadband service and VOD and guide information. That is why on Comcast you can use VOD and get guide information without any extra equipment.

FiOS isn't restricted to delivering all of their services over QAM. So VZ dedicates all of their QAM space for channels instead of trying to add in internet and VOD/guide in there as well. That's where the Actiontec comes into play - since VZ uses IP to deliver VOD and guide information the STBs need that additional connection to get it.

av3

join:2002-03-20
Gaithersburg, MD

Ok, still trying to get some insight here reading the replies. So Comcast has 'channels' or frequencies coming into the house for VOD that's separate from those that carry TV and Internet service.

Would this mean with FiOS that if 3 STB's were watching VOD that this bandwidth is taken from the available Internet bandwidth?



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

Technically yes, but FiOS's internet service is overprovisioned for that very reason. You'll still obtain full advertised speeds even when you have multiple VOD streams playing. When you order 50/35, you actually get ~60/40, and so on.

If you have 6 boxes all using VOD at the same time, you may see some hit. VZ used to dynamically adjust the cap to compensate, but I dont think they do that anymore?

The biggest issue with cable's approach is that Internet, phone, VOD, and conventional TV all share the same coax. Each channel is around 6MHz and most cable companies use either ~750 or ~815MHz. This limits how many channels they can dedicate for traditional TV, internet (cable companies now use up to 12 channels between downstream and upstream for internet alone), VOD, etc.

Verizon has plenty of "space" available on the fiber, so they split it up there instead of in the Coax RF spectrum.
--
University of Southern California - Fight On!



Zero

join:2009-07-01
Collegeville, PA
reply to av3

said by av3:

Would this mean with FiOS that if 3 STB's were watching VOD that this bandwidth is taken from the available Internet bandwidth?

Yes it would. When a VOD program is requested, the OLT provisions your data connection for additional dedicated IP bandwidth.


aaronwt
Premium
join:2004-11-07
Woodbridge, VA

said by Zero:

said by av3:

Would this mean with FiOS that if 3 STB's were watching VOD that this bandwidth is taken from the available Internet bandwidth?

Yes it would. When a VOD program is requested, the OLT provisions your data connection for additional dedicated IP bandwidth.

Not enough to come anywhere close to compensating for three VOD streams.