[Tig] Re: other stuff at IBC?
Tue Sep 24 00:25:31 BST 2002
Hi Rick, Ken, et al.
GSN is an evolution of Hippi. It stands for Gigabit System Network and was
formerly known as Hippi-6400. It is a parallel interface capable of
delivering 6400 Mbit/s (hence the name) or 800 Mbytes/s over 30+ meters of
multipolar copper cable. Considering a 2k frame (full aperture,
10bit/component, log or lin, doesn't really matter) is about 12 MB
(2048*1556*10*3/8) you have a theoretical maximum of 800/12 = ~ 60 fps.
From theory to practice, though there's usually a gap. It would be hard to
see more than 780 MB/s from GSN, and there's some overload given by file
In the case of debate though my guess is that the machines cannot still
provide enough data to fill the bandwidth, maybe for lack of internal
bandwidth even though that seems unlikely (depending on what bus they put
their networking cards onto) . As far as my knowledge goes there's plenty
of room in GSN for real time 2k transfers. (If you apply the math to 4k,
very roughly you should have slightly less than 20 fps at 4k which is circa
Sebastian "more background in networking & systems than in film" Sylwan
At 21:22 23-09-02 +0100, Ken Robinson wrote:
>I have to say when I was 'informed' about the Vialta, I was surprised and
>Re GSN speeds.... Thomson, anyone????
>It is my understanding that GSN is not capable of more than 18 - 20fps. Will
>someone out there in TIG land confirm this?
>From: Ken Robinson [mailto:crash2010 at yahoo.com]
>Sent: Thursday, September 19, 2002 8:52 AM
>To: Greg Dildine; tig at tig.alegria.com
>Subject: Re: [Tig] Re: other stuff at IBC?
sebastian at vrmmp.it
Direttore Tecnologico - Chief Technology Officer Tel.
Virtual Reality & Multi Media Park
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