Or instead use USB 2.0 hubs connected to a USB 2.0 root hub, where ((480 Mbit/sec net)/24 devices) == 20 Mbit/sec per device means there's plenty of bulk bandwidth (since no DSL technology I've heard of goes above around 6 Mbit/sec)
hmm, I should've known this earlier. I thought that only USB2 devices could take advantage of the increased bandwidth, and USB1 devices ran in a backward compatibility mode. :(
They do. Some of that backward compatibility is through a feature in the USB 2.0 hubs: a "transaction translator" (or "TT"). So there's your USB2 device!
TTs turn full (and low) speed transfers into high speed "split transactions", a few concurrent on each 2.0 hub (more on some such hubs). So six usb2 hubs might handle handle ten+ times the bandwidth of usb1, even used just with usb1 devices.
So far there's no "ehci-hcd" support for split ISO transactions, but it sounds like you should be able to use the bulk mode there without too much trouble.
Anyway, In the setup you describe do you use "ehci" ?
Well, "ehci-hcd". Get the latest driver, it getting closer to stable (and the 2.4 version is due for an update). I'd say to use a NEC (or Philips) add-in PCI card for now, they're least likely to trip over driver issues.
- Dave
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