On 12/07/2009 05:36 AM, Gene Heskett wrote: > > 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. > >
Slightly off topic but... I have had the pleasure of working with multiple usb devices (in the 1000's) and I can say that I was able to get a 4 core, intel with 8GB RAM to handle 500 devices at the same time with additonal pci->usb cards. The only ones worth any time are made by Belkin. To stream data to so many devices at one time you need a lot of available memory. 2GB will handle about 100 devices nicely without sacrificing any transfer speed. A single USB 7 port hub can be made to chain 1x7 port hub-> 7 x 7 port hub-> 1 x 4 port hub to give a total of 50 devices at one time. You can modularise this chain to get 100 devices running off 1 usb bus. I have my systems installed at La Louvre for instance where they are running very well. I had no chance to test latency for audio recording but from my experience there are only two usb-2.0 chips on the market that get anywhere near the 480Mb/s bandwidth available for usb-2.0 and they are both used by Belkin. My experience with usb cable lengths > 3 meters is that they require a booster. Patrick Shirkey Boost Hardware Ltd _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
