Re: USB device allocation

Pavel Machek (pavel@atrey.karlin.mff.cuni.cz)
Wed, 6 Oct 1999 12:07:08 +0200


Hi!

> > Previous numbers are unusable :-(: their either crash with
> > existing device, or there's only convient room for one such
> > device where around 16 are needed.
>
> How many really need 16?

You can have up to 255 devices on each usb bus. There are already
machines with 3 usb buses.

> Let's be a bit more reasonable...

I know I want >32 modems. Creating modem farm is one of valid reasons
to use usb modems.

> 0 => 31 USB Serial (Mouse or Modem)

They are not the same. Mouse is much different from modem.

> 32 => 47 USB Printers
> 48 => 63 USB Scanners
> 64 => 79 USB Cameras

They do not need device numbers.

> 80 => 95 USB Keyboards

They do not need device numbers... yet.

> 96 => 111 USB firmware downloaders
> 112 => 239 Reserved for future definition
> 240 => 255 USB Experimental
>
> Remember also that the names are reasonably irrelevant, and only the
> node numbers actually matter.

-- 
The best software in life is free (not shareware)!		Pavel
GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+

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