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Twisted Pair Ethernet (10baseT/UTP) Wiring

When connecting just 2 PC's together with Twisted Pair Ethernet (10baseT/UTP ) ,
there is a possibility to do it without a hub:

BUT: it is now a different type of cable: it is a "crossed" 10baseT cable !
Using a 'regular' cable (which is supposed to be used for connection to a hub) is a common
cause of error, such a 'regular' or 'straight' 10baseT cable does NOT work in such a configuration
without a hub.

I strongly suggest to purchase a cable, but if you think you can make it properly, here is the layout
of such a crossed 10baseT-cable (i.e 10 MHz, this cable is NOT for 100baseT/100Mhz, for that look at
Twisted Pair Ethernet (100baseTX/100BaseT4) )

(please see also : www.johnscloset.net/wiring/index.html )

pin   pin  
1 <--------------------------------> 3  
2 <--------------------------------> 6  
3 <--------------------------------> 1  
4 < not used >    
5 < not used >    
6 <-------------------------------------> 2  
7 < not used >    
8 < not used >    

On Category 3 or 5 grade Twisted pair cable, it should be wired as:

Pin wire signal
1 White/Orange Transmit -
2 Orange/White Transmit +
3 White/Green Receive -
4 Blue/White  
5 White/Blue  
6 Green/White Receive +
7 White/Brown  
8 Brown/White  

where pin1 is the one on the left if you hold the RJ45 connector with
the pins facing up. 4,5,7,8 not used in 10mb network.

To make a Cross Over patch cable for hub to hub or computer to computer connections:

Pin Connector#1 <---cable---> Pin Connector#2
1 White/Orange   1 White/Green
2 Orange/White   2 Green/White
3 White/Green   3 White/Orange
6 Green/White   6 Orange/White

for distances over 10ft, the "pairs" are important for data loss prevention.
[less errors due to electromagnetic fields].

Where is Pin#1:

Making a cross-cable yourself ?

You will need to invest in proper tools
(which may be more expensive than
buying a small hub and regular cables)

More information on Self-Made Twisted Pair cables :



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