[opendtv] Re: opendtv Digest V3 #110
- From: James Fancher <jim.fancher@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 09 May 2006 12:33:40 -0700
On 5/8/06 23:06, "FreeLists Mailing List Manager" <ecartis@xxxxxxxxxxxxx>
wrote:
> At Small Tree
> Communications, chief executive officer Corky Seeber has been banging
> the drum for 10-Gbit Ethernet awareness among Macintosh developers but
> says lower-level developers appear to be in a fog.
Lost in the fog of guaranteed bandwidth. Until storage developers can
deliver storage with dual 10 GigE interfaces that provide guaranteed
bandwidth, video developers are going to continue to use the protocols that
provide the latency and bandwidth that their users require. Firewire may be
old but it delivers deterministic latency and isochronous data. Infiniband
is the only protocol today that can over a single connection deliver 4K
playback. This year at NAB AJA had a demo in their booth of 2K playback
using dual 4 Gbit FC. In order to do 4K playback it takes 6 channels of 4
Gbit FC. Using UDP you can achieve rates that approach the lower end of the
4K playback curve. FC uses 8/10 coding to insure data at the other end.
Until the TOE's in 10 GigE products offer similar FEC UDP is not a practical
way to send data for playback. In the end all of this adds latency and when
I have editors complaining about "slow" systems with one millisecond
increase in delay this is not what you want to add to the mix.
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