Re: Source of reliable full-speed hubs for testing?

On Tue, 13 Nov 2007, Phil Endecott wrote:

> Dear Experts,
> 
> I needed to check that some of my stuff would work correctly at 12 
> Mbits/s, so I bought a full-speed hub to plug between host and device.  
> But this hub has more problems than my own stuff!  It has a 
> single-sided PCB about 35mm square with a port on each edge, and a 
> single chip under one of those black blobs of gunge.  They even 
> economised by not fitting one of the four screws.  With some 
> combinations of host and device it simply doesn't work at all ("port 2 
> not enabled, trying reset again..." over and over); with other 
> combinations it works for a bit and then seems to momentarily 
> disconnect from the host; with a few combinations it seems to work 
> correctly.  If anyone's curious, it claims to be an Atmel chip; 
> vendor=0x03eb, product=0x0902.
> 
> I'm aware that problems with cheap hubs are not uncommon, but 
> full-speed hubs are getting hard to find and it looks to me as if the 
> ones that are left are the very cheapest kind.
> 
> I'm guessing that many readers have a full-speed hub that they use for 
> testing.  So, does anyone have any recommendations for particular 
> models that are available and known to be good?  (From a European 
> supplier preferably, but I'll consider anything.)

In case you can't find a full-speed hub, you should be able to force 
your computer to run at full speed by unloading ehci-hcd.  That might 
be sufficient for your needs.

Alan Stern


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