25 pair UTP distribution

RouterOS General
1

Hi to all,

I know this is not very good place to ask such a question, but since MikroTik stuff is all network-related, maybe someone here can provide some info or give some links about pair distribution in 25 pair UTP cable. I mean there are things like crosstalk, attenuation, external interference.. And I’d like to complete everything with a single try without experiencing problems that could emerge due to incorrect wire mappings.

I’m aware that some pairs are twisted more and others less, so my guess is that I should use one of each for a client connection. But what I don’t know is how to choose spacing between pairs.. For example is it ok to use neighbor pairs for one ‘exit’.

For those that don’t know what I’m talking about, my cable looks like this:
http://en.wikipedia.org/wiki/25-pair_color_code

What I’m trying to do is to run few such cables from my server room to the distribution boxes from where clients are connected with ordinary 4 pair UTP cables.

2

As far as I know, one of Latvian providers seem to use this technology in multiple-apartment houses. They have a huge box with switch, ups, fiber converters and patch panel in the middle of building and those 16 and 25 pair cables run to the next stairways and are distributed there. Can’t seem to notice anything bad about that - things are neat and not too many switches in a single building. It still depends on a cable price and other factors.
Another thing - since Chinese manufactureres are making good and cheap fiber converters and you can import the fiber from Indonesia for price, that is way less than cat5 you gotta ask yourself a question about moving away from copper.