[ILUG] [OT] Networking...

[Chris Higgins]

On Wed, 10 Mar 2004 07:57:11 GMT
Ken Gilmour <ken at playersonly.com> wrote:

> Hiya Boris
> 
> On Wed, 10 Mar 2004 07:46:57 +0000 (GMT), ilug at linux-is-groovy.co.uk
> wrote:
> > both devices are happily operating at 100BaseT, whereas I thought
> > that more than 4 wires were required for 100BaseT.

Nope - 10baseT & 100baseT use 2 pairs (4 wires).
1000baseT uses all 4 pairs ( 8 wires )

> 
> Hmm... correct me if i'm wrong but i've always been under the
> impression that it uses one pair for half duplex and two pair for full
> duplex.

All the current 802.blah standards are freely downloadable

http://standards.ieee.org/getieee802/

Section 14.1.2 says

14.1.2.1 - Twisted pair link: A twisted-pair link segment and its two attached MAUs
14.1.2.2 - Twisted pair segment: Two simplex link segments for connecting two MAUs

If you read the spec you'll see how it handles half & full duplex links.

> 
> Regards,
> 
> Ken
> 
> 
> 
> -- 
> Irish Linux Users' Group
> http://www.linux.ie/mailman/listinfo/ilug/
> 


--

Chris Higgins                              Cisco Learning Partner
Darach Technology Ltd                      tel: +353-1-6204370
email: chris.higgins at darach.ie          fax: +353-1-6204371
http://www.darach.ie