[opendtv] Re: IPTV on AP: Interactive TV Poised for a Rollout (Feb 13)
- From: Prashant Desai <prashant.desai@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 18 Feb 2005 13:15:52 +0530
How in such case [ multicast for VOD one to one delivery ] the interactive
sessions [ using FW, RW , pause etc ] gets handled ?
regards,
Prashant Desai
----- Original Message -----
From: "John McClenny" <jamcclenny@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, February 18, 2005 4:47 AM
Subject: [opendtv] Re: IPTV on AP: Interactive TV Poised for a Rollout (Feb
13)
> On Thu, 17 Feb 2005 09:31:12 -0800, Kon Wilms <kon@xxxxxxxxxxxx> wrote:
> > On Thu, 2005-02-17 at 08:04 -0500, Craig Birkmaier wrote:
> > > In the example I cited, several homes are viewing a VOD program that
> > > is being delivered via a multicast, as opposed to individual unicasts
> > > to each home. If one home hits pause, does the program pause for
> > > every other home on that multicast? I think not.
> >
> > You missed my point. You're equating single one-on-one sessions with
> > unicast delivery. One-on-one sessions can also be delivered via
> > multicast. As can the one to many sessions. My point is that it is more
> > advantageous from a robustness and server load point of view to simply
> > deliver everything as multicast.
>
> You can just as easily deliver over unicast UDP as multicast.
>
> > In terms of what a server can dish out, it is easier to multicast than
> > unicast. The server doesn't have constant ACK/NACKs being received, it
> > doesn't have to keep the endpoint socket connection up, and needs no
> > mechanism to re-establish connections if the client drops out. In effect
> > your servers become simple playout pumps.
>
> None of that nasty TCP stuff with UDP.
>
> UDP routin is easier than multicast routing for the network elements.
> Multicast makes for more work than UDP.
>
>
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