Re: Cat 5 wiring


Subject: Re: Cat 5 wiring
From: Arthur Corliss (arthur@corlissfamily.org)
Date: Tue Sep 17 2002 - 22:45:15 AKDT


> That is correct - pins 3 and 6 are receive and pins 1 and 2 are
> transmit. The rest are not used.
>
> How you would use the other 4 I don't know - presumably stripping
> the insulation back aways and splitting it - which would seriously
> degrade your reliability. I would say theoretically there's no
> reason you couldn't, but you probably would lose more than it's
> worth in bad packets (especially with 100mbit ethernet)
>
> Just my 2c - It'd be fun to try it and do some tests though! :)

That's not accurate: two pairs are used for 10bT, but 100bT requires all
four:

----100Base-T----
EIA/TIA-568A:
        1) T3--Wh/Gr
        2) R3--Gr/Wh
        3) T2--Wh/Or
        4) R1--Blu/Wh
        5) T1--Wh/Blu
        6) R2--Or/Wh
        7) T4--Wh/Br
        8) R4--Br/Wh
EIA/TIA-568B (AT&T 258A):
         Reverse pairs 2 & 3

----10Base-T----
IEEE:
        1) T2--Wh/Or
        2) R2--Or/Wh
        3) T3--Wh/Gr
        4)
        5)
        6) R3--Gr/Wh
        7)
        8)

        --Arthur Corliss
          Bolverk's Lair -- http://arthur.corlissfamily.org/
          Digital Mages -- http://www.digitalmages.com/
          "Live Free or Die, the Only Way to Live" -- NH State Motto

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This archive was generated by hypermail 2a23 : Tue Sep 17 2002 - 23:27:20 AKDT