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Patch Cables
Straight-Through or Cross-Over
?
In general, the patch cords that
you use with your Ethernet connections are "straight-through", which
means that pin 1 of the plug on one end is connected to pin 1 of the
plug on the other end.
Crossover cables are "crossed"
end to end data cables aren't.
If you have a network hub that has an uplink port on it then you do not
need to make (or purchase a cross-over cable). Just switch the port on
the hub to the 'uplink' mode.
If your hub does not have an 'uplink' port on it then the only way to
cascade another hub or attach a cable modem is to use a crossover cable.
For small jobs involving a pair
of computers, or home wiring between two computers will not normally
require a hub and you can use a crossover cable.
When wiring your own crossover
cable to connect two PCs together, simply change ONE end of an ordinary
RJ45 patch lead to that shown in following diagram.
It helps for future reference to
mark or attach a tag to the crossover cable so that you do not attempt
to use it as a 'normal' patch lead at some time in the future.
RJ-45 Connectors - Patch Cables for Category 5
Wire
REMEMBER:
To hold the RJ45 connector with the 'clip' on the bottom.
To have to the 'opening' (where you insert the cable) facing you
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Cross Over Patch Lead Pin
to Pin Wiring
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PIN
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RJ45 - 258A
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PIN
|
RJ45 - T568A (T568B) |
| |
1
|
white/green |
1 |
white/orange |
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2
|
green |
2 |
orange |
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3
|
white/orange |
3 |
white/green |
| |
4
|
blue |
4 |
blue |
| |
5
|
white/blue |
5 |
white/blue |
| |
6
|
orange |
6 |
green |
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7
|
white/brown |
7 |
white/brown/ |
| |
8
|
brown
|
8 |
brown
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Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8 |
to
to
to
to
to
to
to
to
|
Pin 3
Pin 6
Pin 1
Pin 4
Pin 5
Pin 2
Pin 7
Pin 8 |
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Pins 4, 5, 7 and 8 remain the same
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