(snip regarding two 100baseT connections on a four pair cable)
Well, you should be a little more specific. The 100baseVG and
100baseT4 protocols use four pairs, but your chance of running into them is extremely small. (Slightly better than winning the state lottery.)
100baseTX uses two pairs. 1000baseT does use four pairs.
It will likely work fine, though I would try to keep well below 100m. 50m sounds fine to me. It would be best to wire the jacks in the normal manner and split after coming out of the jacks. There are splitters similar to those used for two line phones. If you have a crimper you could crimp two cables into a single plug. I would only recommend the latter for a home or other low budget application such as a K-12 school.
For a commercial installation be sure to label it well so that future network administrators know what is in place.
"T. Sean Weintz" wrote in news: email@example.com:
Thanks folks for the confirmatory replies, ABC's reply threw me for a moment :-). This is for home use and is to run two extra links to the shed/workshop at the bottom of the garden (I have two 10baseT (but CAT5E) cables out there but I want to run four off 10/100baseT connects.
Maybe it would be better to add a small 4 port hub. Also give some isolation from lightening damage.
Running copper ethernet between buildings is always risky, moreso if the satellite building has a subpanel and ground stake. I don't know what UK practice is with ring mains and such. I presume the shed has power, neutral & ground fed from the main building.
A better solution would be to get a couple of inexpensive ethernet switches at both ends and that way you have room to grow beyond the 2nd link you are describing and maintain a proper connection without rigging it.