Hi,
I have attached following hubs in the scenerio creating the issue:
1) First Hub is self-powered hub. It is 2.0 compliant hub. Brand name is: DLink.
2) Second hub is bus-powered hub. It is also 2.0 compliant. This hub is drawing power from the First hub. I tried with lots of branded hubs but the results remain the same.
I am only attaching the second hub to the first self-powered hub and no other device to first hub.
On the other hand in the ideal scenerio:
I attach my USB bulk devices to single bus-powered hub, and everything works fine.
a) Do you feel the issue is related particularly with the hub ? Especially The type/brand of hubs ?? How ?
b) Can this be related with the power management of Macintosh system ?
Did anybody encountered similar issue before ?
Please send your comments / suggestions for the same.
Thanks again,
Rohit
On 10/4/06, Rhoads Hollowell <email@hidden
> wrote:
Please tell us what kind of hubs you are using in the scenario
described below. Are they self powered or bus powered? Are they USB
2.0 compliant or are they old USB 1.1 compliant hubs? If you could
tell us the brand name, that would be good as well.
Rhoads Hollowell
USB Software Team
Apple Computer, Inc.
On Oct 4, 2006, at 8:27 AM, rohit dhamija wrote:
> ============
> Problem Scenerio:
> a) I cascade 2 hubs.
> b) I attach my 2 devices to the last hub.
> c) Now when I plug-out my 1 usb bulk device, the other device
> resets itself !!!
> The other device resets itself on removing the first device and my
> communication with the application also resets at this point of time
> :( Why ??
>
> "APPLE_Machine_ROOTHUB<==>ONE_HUB<==>SECOND_HUB<==>My 2 usb devices
> are attached here"
> ============
>
--
Rohit Dhamija(M) 9818446545
