LAN and Telecom Cabling How to RJ-45 with 3 pair (6 wires) cable

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Subject Author Date
How to RJ-45 with 3 pair (6 wires) cable djenka2 08-16-06
Posted by DecaturTxCowboy on August 17, 2006, 7:46 am
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glen herrmannsfeldt wrote:
> I think your finger slipped, that should be (1,2) and (3,6),
> parenthesis indicating wires of the same twisted pair.

They did, my bad. (1,2) and (3,6) is correct.

Posted by Robert Redelmeier on August 17, 2006, 9:07 am
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> Hi, I have network cable thru newly fnished house, the wiring is
> done from mechanical room into 6 different rooms. I am planning
> to crimp RJ-45 connectors on each end but have the problem because
> I don't know whch scheme to use. The problem is that in some
> rooms I have 4-pair (8 wires) but in some rooms I have 3-pair
> (6 wires) cables. What scheme should I use for RJ-45 connectors
> in both cases in order to have all 6 rooms fully functional.
> Website links, pictures, ideas is all welcome!

The best way to do this is to terminate cables at the head
end onto a patch panel. Crimping plugs onto solid is strictly
temporary, and will create intermittants with flexing.

In either case, for residential use I'd follow TIA-570 and go with
T-568A (even though -B is more common in commercial use) in order
to have the second POTS line where it's expected (orange pair).

-- Robert




Posted by djenka2 on August 17, 2006, 9:51 pm
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I've just found that only 4 wires are used for Network/Ethernet, to be
exact, pins 1, 2, 3 and 6.
And in 5 rooms I have 8 wires only in living area I have 6 wires, I
think I am OK.

Thanks anyway!


Robert Redelmeier wrote:
> > Hi, I have network cable thru newly fnished house, the wiring is
> > done from mechanical room into 6 different rooms. I am planning
> > to crimp RJ-45 connectors on each end but have the problem because
> > I don't know whch scheme to use. The problem is that in some
> > rooms I have 4-pair (8 wires) but in some rooms I have 3-pair
> > (6 wires) cables. What scheme should I use for RJ-45 connectors
> > in both cases in order to have all 6 rooms fully functional.
> > Website links, pictures, ideas is all welcome!
>
> The best way to do this is to terminate cables at the head
> end onto a patch panel. Crimping plugs onto solid is strictly
> temporary, and will create intermittants with flexing.
>
> In either case, for residential use I'd follow TIA-570 and go with
> T-568A (even though -B is more common in commercial use) in order
> to have the second POTS line where it's expected (orange pair).
>
> -- Robert


Posted by DecaturTxCowboy on August 17, 2006, 11:56 pm
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djenka2 wrote:
> I've just found that only 4 wires are used for Network/Ethernet, to be
> exact, pins 1, 2, 3 and 6.
> And in 5 rooms I have 8 wires only in living area I have 6 wires, I
> think I am OK.
>
> Thanks anyway!

The 3-pair cable most not likely 100 Mbps CAT5 rated, should work for 10
Mbps though. Compare the number of twists per inch to a CAT5 cable.

Posted by glen herrmannsfeldt on August 18, 2006, 12:25 am
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DecaturTxCowboy wrote:

(snip)

> The 3-pair cable most not likely 100 Mbps CAT5 rated, should work for 10
> Mbps though. Compare the number of twists per inch to a CAT5 cable.

It isn't so much the twists per inch, but that the four pairs need
to be sufficiently different.

For short enough distances, it will probably work for 100baseTX anyway.

-- glen


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