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Topic:
If Green/Green-White Pair Missing in T568A RJ45, Should T100 Work?
This thread has 4 replies. Displaying all posts.
Post 1 made on Thursday September 8, 2016 at 23:33
Mogul
Senior Member
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Attempted to repurpose some daisy-chained CAT5 pulled for phone lines in mid-1990's for use as a T100 data link. Somewhere along one of the runs, Pins 1 and 2 (GW and G) are broken/missing/damaged.  Assuming all other conductors are ok, should this cable work for T100 link?

Can an anyone explain in more detail how each pair is utilized in a T10 vs. T100 vs. T1000?

TIA

Last edited by Mogul on September 9, 2016 01:29.
"Whatever is rightly done, however humble, is noble." [Sir Henry Royce]
Post 2 made on Friday September 9, 2016 at 00:12
iimig
Senior Member
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I'm assuming you mean 10BaseT, 100BaseT and 1000BaseT.

Pins 1,2,3, and 6 are all used on 10/100 networks. Pins 1-8 are used on Gigabit or 1000BaseT. No matter if the termination is TIA-568A or B, the green pair is going to be used on pins 1 and 2, or 3 and 6. For this reason, if the green pair is truly damaged, you will need to move them into a position that isn't used such as where the brown or blue pair would normally go. Whatever pair you swap it with will go back where the green pair goes.

Here is an example that should work:

1 - Blue Stripe
2 - Blue
3 - Orange Stripe
4 - Green
5 - Green Stripe
6 - Orange
7 - Brown Stripe
8 - Brown
The less I say, the smarter I will appear
OP | Post 3 made on Friday September 9, 2016 at 01:28
Mogul
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Very helpful--Many thanks.
"Whatever is rightly done, however humble, is noble." [Sir Henry Royce]
Post 4 made on Friday September 9, 2016 at 01:55
Ernie Gilman
Yes, That Ernie!
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December 2001
30,104
There is absolutely nothing sacred about the colors of the wires, just keeping them in pairs and respecting polarity.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 5 made on Friday September 9, 2016 at 02:43
King of typos
Loyal Member
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June 2002
5,275
Obviously this modification has to be done at both ends of the cable. It would also be nice to attache a note to both ends for future techs. I've learn from personal experience from this.

Having to redo 30 to 40 cables one night at work and not knowing one of them had specially wiring really pissed me off. Couldn't tell you how many times I redid and redid that one cable. 1,000 foot run and really not knowing where on the casino floor it went because the floor lay out changed dozen of times over the years.

KOT


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