Re: [LAD] FOSS Ethernet Soundcard

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To: <linux-audio-dev@...>
Date: Sunday, December 6, 2009 - 6:36 pm

On Sunday 06 December 2009, Pieter Palmers wrote:
[...]

>Greets,

At the expense of a truly horrible latency built into the usb specs. In
another field (my interests are best described as eclectic), involving far
less data at a time than audio, machine control, aka cnc milling and similar
operations where the machine must be under the computers control at sub-
millisecond intervals for servo's and < 50 microsecond intervals for stepper
motors, those who have tried to go down the usb road have generally failed
rather miserably. So that road is both well traveled and has been found
wanting. 100 millisecond latency's just cannot be tolerated for that usage.

Ethernet is everywhere, and is one of the reasons my previous messages
favored it. Unforch, while I grant that firewire is hands down superior, and
I have a couple of ports here, it is apparently a totally daisy chain
topology from a single host port, and AIUI, cable lengths are very limited
in comparison to ethernet. However there is a 6 port 'hub' at
($38.99)
to expand the limited number (usually 1 or 2) of ports found on todays
motherboards, and the total cable length to 9 meters, and even the pluggin
cards available seem to be limited to 4 ports. I see that for 1394b, cables
up to 32 feet are available but at the price I'd have to assume there is a
booster hub in the middle. With pricy optical convertors, to 3/8's mile
using glass fiber. (actually it is probably plastic if it has that length
limitation, glass, good glass, checked out at .4 db loss over 39 kilometers
when we fed the local cable systems from our studios, several years ago now.

ATM out of 6 mobo USB ports and 6 hubs making branches as deep as 4 sub-hubs,
I have only 7 open sockets. And I don't believe my usb map is anywhere near
a record setter.

Were there a firewire audio gizmo on site, I might have it working too, so go
build one, I'm waiting. (and don't forget the daisy chain, most folks ignore
it) The first port here is for my movie camera, which kino generally runs
quite nicely, with very nearly realtime video and audio, only a slight echo
between the speaker on the camera and my speakers. :)

--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The NRA is offering FREE Associate memberships to anyone who wants them.

Kgnghtbrd: I wouldn't kow, I see no need for a spellchecker yet
you were saying?
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Messages in current thread:
Re: [LAD] FOSS Ethernet Soundcard, Patrick Shirkey, (Sun Nov 29, 6:20 am)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Mon Nov 30, 1:47 pm)
Re: [LAD] FOSS Ethernet Soundcard, Patrick Shirkey, (Mon Nov 30, 10:21 pm)
Re: [LAD] FOSS Ethernet Soundcard, Folderol, (Tue Dec 1, 7:24 pm)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Tue Dec 1, 8:47 pm)
Re: [LAD] FOSS Ethernet Soundcard, Folderol, (Wed Dec 2, 5:19 pm)
[LAD] Milivoltmeter - Was FOSS Ethernet Soundcard, Folderol, (Thu Dec 3, 10:30 pm)
Re: [LAD] Milivoltmeter - Was FOSS Ethernet Soundcard, Jack Hildwine, (Fri Dec 4, 3:27 am)
Re: [LAD] Milivoltmeter - Was FOSS Ethernet Soundcard, Tracey Hytry, (Fri Dec 4, 3:19 am)
Re: [LAD] FOSS Ethernet Soundcard, Adrian Knoth, (Tue Dec 1, 9:20 am)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Tue Dec 1, 5:12 pm)
Re: [LAD] FOSS Ethernet Soundcard, Pieter Palmers, (Tue Dec 1, 6:08 pm)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Tue Dec 1, 8:50 pm)
Re: [LAD] FOSS Ethernet Soundcard, Pieter Palmers, (Sun Dec 6, 4:42 pm)
Re: [LAD] FOSS Ethernet Soundcard, Gene Heskett, (Sun Dec 6, 6:36 pm)
Re: [LAD] FOSS Ethernet Soundcard, Patrick Shirkey, (Sun Dec 6, 9:54 pm)
Re: [LAD] FOSS Ethernet Soundcard, Gene Heskett, (Mon Dec 7, 12:52 am)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Tue Dec 1, 12:56 am)
Re: [LAD] FOSS Ethernet Soundcard, Michael Chapman, (Tue Dec 1, 8:55 am)
Re: [LAD] FOSS Ethernet Soundcard, Patrick Shirkey, (Tue Dec 1, 7:23 am)
Re: [LAD] FOSS Ethernet Soundcard, torbenh, (Wed Dec 2, 10:10 am)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Tue Dec 1, 6:32 pm)
Re: [LAD] FOSS Ethernet Soundcard, drew Roberts, (Wed Dec 2, 3:06 pm)
Re: [LAD] FOSS Ethernet Soundcard, Folderol, (Wed Dec 2, 5:00 pm)
Re: [LAD] FOSS Ethernet Soundcard, , (Wed Dec 2, 4:19 pm)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Mon Dec 7, 7:41 pm)
Re: [LAD] FOSS Ethernet Soundcard, Jens M Andreasen, (Mon Dec 7, 10:06 pm)
Re: [LAD] FOSS Ethernet Soundcard, , (Mon Dec 7, 10:38 pm)
Re: [LAD] FOSS Ethernet Soundcard, Jörn Nettingsmeier, (Mon Dec 7, 11:47 pm)
Re: [LAD] FOSS Ethernet Soundcard, , (Mon Dec 7, 11:57 pm)
Re: [LAD] FOSS Ethernet Soundcard, Paul Davis, (Mon Dec 7, 11:04 pm)
Re: [LAD] FOSS Ethernet Soundcard, Folderol, (Mon Dec 7, 11:03 pm)
Re: [LAD] FOSS Ethernet Soundcard, Dan Mills, (Mon Dec 7, 11:03 pm)
Re: [LAD] FOSS Ethernet Soundcard, , (Mon Dec 7, 11:39 pm)
Re: [LAD] FOSS Ethernet Soundcard, Folderol, (Wed Dec 2, 5:13 pm)
Re: [LAD] FOSS Ethernet Soundcard, Adrian Knoth, (Wed Dec 2, 3:21 pm)
Re: [LAD] FOSS Ethernet Soundcard, drew Roberts, (Wed Dec 2, 6:16 pm)
Re: [LAD] FOSS Ethernet Soundcard, torbenh, (Wed Dec 2, 4:41 pm)
Re: [LAD] FOSS Ethernet Soundcard, , (Wed Dec 2, 5:07 pm)
Re: [LAD] FOSS Ethernet Soundcard, Jörn Nettingsmeier, (Wed Dec 2, 6:38 am)
Re: [LAD] FOSS Ethernet Soundcard, nescivi, (Sat Dec 5, 4:25 pm)
Re: [LAD] FOSS Ethernet Soundcard, Michael Chapman, (Sat Dec 5, 1:58 pm)
Re: [LAD] FOSS Ethernet Soundcard, Folderol, (Tue Dec 1, 7:00 pm)
Re: [LAD] FOSS Ethernet Soundcard, Karl Hammar, (Tue Dec 1, 8:40 pm)