Wiring a RJ-45 Network
   
   Lots of people have problems when trying to connect two or more computers in a local LAN. I'll explain how to connect a simple network with RJ-45 wire. If you are going to connect only and only two computers then you'll not need a (Switch or HUB) a single wire could do it, it's called a crossover wire. Else if you want more than two computers using RJ-45 then a (Switch or HUB) is needed.
   Let's talk about the Difference between a Switch and a HUB.
The main difference is that a in a HUB, when one computer sends a data packet to another one, the packet is send to all the computers connected to it.
A HUB is slower than a Switch, because for example if you have a 64Kb/s internet connection and you use 8 computers to access internet at the same time, you'll have 64/8=8Kb/s for each computer.
A Switch "remembers" where it send the last packet and it doesn't need to send it to all the other computers in the LAN.
The speed is not divided using a Switch.

   Conclusion: if you have some computers accessing at the network resources at the same time, then it better that you use a Switch, if you only want to play lastest 3D action game with 3 computers or you can't afford a Switch, then a HUB will work well for you.
 

 

 
Speed

There're 10Mb/s LAN cards (older ones) and 10/100Mb/s LAN cards, and there are also 10Mb/s HUBs, 10/100Mbs HUBs and 100Mb/s HUBs.

Take a look at the next table to check for your network speed
 
LAN cards HUB Network Speed
10 10/100 10
10 100 Will not work
100 10 10
100 10/100 100

For example: If you have 10Mb/s cards connected to 10/100Mb/s HUB, your network will work at 10Mb/s.
A 10/100 HUB means that you can use 10 or/and 100 LAN cards and every card will work at card speed
 

 

 
 Wire order and colours
   
   This is a very important thing to handle with, because your network will NOT work or work slower thant it could.
There are some basic rules:
- Use UTP (Unshielded Twisted Pair) Category 5 wire for 100Mb/s LANs, and also it's recommended for 10Mb/s LANS, because it's more protected and if some day you upgrade it to 100Mb/s you'll save lot of work.
- Use the Right order and colours, many people make this wrong, just follow the next image for wire colours:
 
 
Crimp tool
Plugs
Crimping
 Standard

   For a "standard" PC to HUB wire use this order AND colours:
Use the same order and colors on both sides of the wire
When looking at the plug the hook is on the back side
 
1- Orange/White
2- Orange
3- Green/White
4- Blue
5- Blue/White
6- Green
7- White/Brown
8- Brown
PC to HUB
 

 
 Crossover

   For a "crossover" PC to PC wire use this order AND colours:
Use one "standard" wiring on one side of the cable and on the other side, this "crossover" cable
When looking at the plug the hook is on the back side
 
1- Green/White
2- Green
3- Orange/White
4- Blue
5- Blue/White
6- Orange
7- White/Brown
8- Brown
PC to PC

 

 

 
 

I hope that this will help you. You can e-mail me for suggestions.
by DrDoom
www.sorgonet.com


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