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Re: USB device resets when attached to Cascading hubs. Why?

Subject: Re: USB device resets when attached to Cascading hubs. Why?
From: Barry Twycross <email@hidden>
Date: Wed, 4 Oct 2006 10:50:06 -0700
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At 10:37 PM +0530 10/4/06, rohit dhamija wrote:

a) Do you feel the issue is related particularly with the hub ? Especially The type/brand of hubs ?? How ?

I would be very suspicious of any USB2.0 hub which seems to be bus powered. A lot of them lie to the host and claim to have a power supply, when they don't. This totally destroys and concept of power management, and can cause all sorts of flaky behaviour.

If you can plug a high powered device (such as an iPod) into such a hub and it successfully enumerates and operates, then the hub is lying to the host. Such hubs are only fit to be debugged with a very big hammer. -- Barry Twycross email@hidden --- USB, it's not a Dyslexic BUS. (Thanks to TC.) _______________________________________________ Do not post admin requests to the list. They will be ignored. Usb mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/usb/email@hidden

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References:
	>USB device resets when attached to Cascading hubs. Why? (From: "rohit dhamija" <email@hidden>)
	>Re: USB device resets when attached to Cascading hubs. Why? (From: Rhoads Hollowell <email@hidden>)
	>Re: USB device resets when attached to Cascading hubs. Why? (From: "rohit dhamija" <email@hidden>)
	>Re: USB device resets when attached to Cascading hubs. Why? (From: "rohit dhamija" <email@hidden>)

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