Halfpeace

On 28th April 2012 we were giving a cable ,called the RJ45 Cable , we're asked to make Straight-Through/Cross-Over  

Straight-through cables get their name from how they are made. Out of the 8 pins that exist on both ends of an Ethernet cable, each pin connects to the same pin on the opposite side. Review the diagram below for a visual example:

Notice how each wire corresponds to the same pin. This kind of wiring diagram is part of the 568A standard. The 568B standard achieves the same thing, but through different wiring. It is generally accepted to use the 568A standard as pictured, since it allows compatibility with certain telephone hardware- while 568B doesn’t.

Straight-through cables are primarily used for connecting unlike devices. A straight-through cable is typically used in the following situations:

Use a straight-through cable when:

1. Connecting a router to a hub

2. Connecting a computer to a swtich

3. Connecting a LAN port to a switch, hub, or computer

Crossover cables are very similar to straight-through cables, except that they have pairs of wires that crisscross. This allows for two devices to communicate at the same time. Unlike straight-through cables, we use crossover cables to connect like devices. A visual example can be seen below:

Notice how all we did was switch the orange-white and green-white wires, and then the orange and green wires.

 This will enable like devices to communicate. Crossover cables are typically used in the following situations:

Use a crossover cable when:

1. Connecting a computer to a router

2. Connecting a computer to a computer

3. Connecting a router to a router

4. Connecting a switch to a switch

5. Connecting a hub to a hub

While the rule of thumb is to use crossover cables with like devices, some devices do not follow standards. Others provide support for both types of cables. However, there is still something that both crossover and straight-through cables can’t do