[opendtv] Re: Internet TV distribution architecture
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 6 Jan 2014 21:52:06 +0000
Craig Birkmaier wrote:
>> Pay attention, Craig. Where exactly do you think Akamai's mirrored
>> servers are physically located, with respect to individual ISP
>> networks?
> Exactly where I stated yesterday.
The question is specific. With respect to ISP networks, you know, those
networks that actually connect individual homes, where are the mirrored servers
located? Within? Outside? A different city?
Now, add to the ISP network a heavy demand for TV content. In bigger cities,
demand in the hundreds of thousands of sessions during prime time or during
popular games, within that ISP's local network in that city. This is new
demand, not currently handled by anyone. Will those new streams originate at
existing mirrored servers? Or will more be required?
Like I said, if you completely ignore bandwidth considerations, a single server
is limited to 64K sessions (65536 - 1024 "well known ports," minus other
registered ports in theory anyway, so actually less than 64,000). So, let's
pretend 64,000 sessions. If a server is managing 64,000 HDTV sessions, each one
average, say, 6 Mb/s, that one server would be transmitting a whopping 384
Gb/s. Do you think that's sensible to expect from one server?
And that's just the first 64K households. I doubt that whoever is managing the
mirrored servers for a major city will be able to get by without adding plenty
of server capacity to what they have today, to accommodate heavy demand for TV
sites. The only question is who jump at the opportunity for this new TV traffic?
> What local ads? If the networks originate the streams you are
> nationalizing what was a local medium.
Possibly. Or, the networks may want to air ads that ALSO specifically target
that local viewership. After all, they are trying to make as much ad revenue as
possible. They might want to incorporate some local content and local ads.
> Clearly, LTE broadcast makes sense for local broadcasters...
Not clearly at all. We went through all of that in depth two years ago. Perhaps
broadcasters can piggyback on existing WISP networks. I very much doubt the
broadcasters would deploy their own thick mesh of transmitters for their own
LTE infrastructure, to achieve anything similar to the b/s/Hz they get today,
and I very much doubt the WISPs in the US would sell smartphones with those
broadcaster-unique frequencies on them. But sure, piggy-back on WISP nets, and
the WISPs will see $ signs.
The reason you need a thick mesh is because the spectral efficiency of LTE
broadcast mode is tied to spacing between towers. No arm-waving on this, please.
Bert
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