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RE: Extending USB Connections
- To: <ukha_d@xxxxxxx>
- Subject: RE: Extending USB Connections
- From: "Keith Doxey" <ukha@xxxxxxx>
- Date: Thu, 6 Dec 2001 11:31:18 -0000
- Delivered-to: mailing list ukha_d@xxxxxxx
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ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
Instead of spending more money on a camera, why not buy a couple of
USB
connectors and make a lead.
PC
USB_Plug (A&B) RJ45 ---------CAT5---------RJ45(A&B + Local 5V
input)USB_Socket <Webcam
Keith
PS.
Dont blame me if it doesnt work !
Umm.. thanks for this Keith
I
might look at buying a cheap (£20) camera and pulling it to bits
then..
Dan
I
would be tempted to try USB over a longer distance.
I
believe the main limitation is in the pair of wires feeding the power. USB
has 4 wires +5v, 0v, A & B. A and B are the data pair, as long as you
used a local power supply at the distant end it might work OK. As I
understand it, the actual DATA is carried as a balanced RS485 type signal
so
should be good for quite a long distance over CAT5.
Of
course, I could be talking B******* as I have never played with
USB.
I
cant test this theory as I dont own any USB kit.
Keith
Excuse the blonde question :-)
but why is their such a limitation on the length
of cable for USB? - do they use very low voltages for their signalling,
and as such this would deteriorate over any distance - say 15
metres?
<Whinge mode>
It just seems such a waste, that I can buy a
reasonable colour web cam for under £50 and I could then have more than
one connected to my pc, that they would all have to be within a few metres
of node Zero!!
</Whinge mode>
Daniel (throwing his toys out
of the box!!)
> Erm, I
didn't think that was what USB / Ethernet adaptors did!
Most
don't , but I'm sure there's some that do ... somewhere ...
>
They're there to give a PC a network connection using a USB port
rather
> than a PCI or an ISA one.
>
> In order to
extend the camera, Dan would need the CAMERA to be able to
> load
the device drivers for the USB network card, if you see what I
>
mean.
yeah, gotcha.
> Am I wrong here? Are there, in
fact, USB extenders that work over
> Ethernet???
I'm sure
I've seen them around, but I've no idea where. Perhaps
someone
else has?
Andy
--
PC-Based Multimedia System -
now working!
http://www.andylaurence.pwp.blueyonder.co.uk/pcbmms
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