Fwd: Re: [MLB-WIRELESS] USB over CAT5 versus coax

[Jason Hecker]

Yeah, USB extenders are all fine and good.  Looking at the USBv1.1 standard 
12mbit USB should be able to be extended without trouble for about 100m 
before the hosts times out waiting for a response from the device it's 
given the token to.  The trick is trying to make passive amplifiers in each 
end that know when to switch trasmission direction, which in USB needs some 
sort of state tracking - ergo a passive dumb solution with some opamps 
isn't good enough.  I have seen others for about US$200 but still that's 
too friggin' expensive.  I have a pile of Cypress EZ-USB controller chips 
here waiting to be used for something, I am short on time but if anyone 
here has 8051 and USB skills maybe we could come up with a simple solution 
using these controllers...?

At 01:59 PM 23/04/2002 +1000, you wrote:
>This USB extender from Gefen allows USB to be carried over CAT5 up to 100m
>which would enable a cheap USB AP to be roof-mounted and fed via cheap CAT5
>rather than awkward and expensive LMR400
>
>http://www.gefen.com/products/extendit/new_kvm_usb_extenders_switches/usb200/index.html
>
>It isn't cheap at US$479 but is food for thought and should decline in price
>eventually.


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