[opendtv] Re: IPTV versus internet TV
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 10 Mar 2005 17:56:03 -0500
John McClenny wrote:
> http://breeze.brightcove.com/p47258018/
By the way, I did disagree with one analogy he made early
on: VoIP for IP-based telephony. He says that VoIP is
comparable to his video over the Internet.
VoIP is somewhat more comparable to IPTV than it is to his
video over Internet. Because VoIP is a carefully built
system designed to emulate the telephone experience, using
protocols such as SIP and MGCP which very explicitly try to
emulate use of telephones with keypads, and provides a
gateway to the PSTN. And many VoIP systems provide an
interface to your standard analog phone, even.
So VoIP is tied to a provider and tries to emulate an
existing service, JUST LIKE IPTV. And QoS is managed by
proper provisioning, which again requires a walling-in
(and use of MPLS etc.).
Whereas his notion of video over the Internet is just a
"simple" evolution of the WWW. Using the Internet for a
telephone-like service has been around for some time, and
results in pretty bad telephone connections. To compensate
for poor jitter characteristics, you end up with huge
lags between outgoing and incoming, considerably worse
than what you'd experience over geosynchronous satellites,
at least for long distance calls.
Bert
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