[Gllug] How to prove a computer is overheating.

[Chris Bell]

On Sun 16 Jan, Peter Childs wrote:
> 
> >Standard ethernet connections 1 to 1    Cross wired cables are connected
> >         ___________________ 
> >         |                 |
> >W/O  ----|                -| 1          1  W/O  3  (W/G)
> >O/W  ----|Cable  Contacts -| 2          2  O/W  6  (G/W)
> >W/Gn  ---|............... -| 3          3  W/G  1  (W/O)
> >Bu/W  ---|              . -| 4          
> >W/Bu  ---|............... -| 5          
> >Gn/W  ---|                -| 6          6  G/W  2  (O/W)
> >W/Bn  ---|(Latch below)   -| 7          
> >Bn/W  ---|                -| 8          
> >         |_________________|
> >
> >Pairs DO cross over in the middle!
> >Only two of the pairs are normally used, the others could be used for
> >telephone or a second data set using splitter adapters.
> >
> >  
> >
>     However 1Gbts ethernet use all 8 wires. Normal Ethernet cables do 
> not cross, The only reason for crossing is if you want a cross over 
> cable, ie no Hub or Switch.
> 
> Peter Childs

   By cross over, I mean that it is NOT
3 W/Gn
4 Gn/W
5 W/Bu
6 Bu/W
for ethernet. There are at least 3 standard connection configurations, and
for ethernet use the pairs are not connected with adjacent go and return for
every pair, which catches out many DIY enthusiasts. If the go and return
legs are not from the same twisted pair it might work for some of the time
but give plenty of errors. You may even find that ordinary telephone wire
works better as long as the pairs are correctly connected.


-- 
Chris Bell

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