[clug] 100 base t
Alex Satrapa
grail at goldweb.com.au
Wed Nov 22 03:11:55 GMT 2006
On 20 Nov 2006, at 19:44, Adrian Blake wrote:
> Questions regarding the physical part of 100 Base t connection:
>
> Voltage levels are 0.6 V to 2 V yes/no
I expect this would be covered by IEEE 802.3, which is a rather
expensive tome that I do not have access to.
> A network switch sends pulses of differing widths to automatically
> determine the speed of the network connection, what are those
> widths and what does it expect in return?
http://en.wikipedia.org/wiki/Autonegotiation - a reasonably technical
article, indicating the timings and tolerances required for
autonegotiation to succeed. This should be of use to your optical
extender project.
> How does a switch determine if it is a full duplex or half duplex
> connection?
This is part of autonegotiation.
> I am trying to construct a very basic but working electrical/
> optical media converter. I wish to avoid using a complex chip which
> acts as a repeater, i.e reframing, timing etc. I need to keep the
> costs down.
Is it really going to be cheaper to do this yourself rather than
invest in an off-the-shelf component that will only cost $200? This
assumes that you're avoiding the complex chip solution for cost
rather than technical issues, but a typical "industrial" application
suitable for most dirty indoor environments might be: http://
www.alloy.com.au/products/rnconfmx.html
Alex
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