It is needed because you need to reverse the signals of a transmit line to a receive signal line. This is what network connectivity devices do, such as hubs, switches, etc. If you aren't using a connection device then the cable has to do that job.
The crossover pipes on a 7.3 ford diesel engine are the pipes connecting the exhaust manifolds to the turbo compressor inlet.
Unless your hub has a switchable port, you use a crossover cable.
When connecting two devices which situation would normally require the use of a crossover.
Traditionally, two switches can be connected together with a crossover cable. A crossover cable should be used whenever two of the same network devices need to be connected together. e.g. Connecting a router to another router, a switch to another switch or a PC to another PC. Using a crossover cable is not always necessary however. Most new network devices include a feature named Auto-MDIX (Medium Dependant Interface Crossover). Auto-MDIX detects what type of cable is connected and automatically changes its own configuration to enable data transmission to the other device. i.e. It does not matter if you use a straight through cable or crossover cable on Auto-MDIX enabled devices. Both will work.
A crossover cable. Some call them console cables.
Same device----> crossover cable Different device->Straight through cable
Connecting two PCs directly using a crossover cable will enable them communicate without using any intermediate network equipment. The connection will work since a crossover cable has TX (Transmitting) and RX (Receiving) terminals that allow direct communication.
when you are connecting same devices like computer to computer or switch to switch or router to router to use cross over cable. when you are connecting different devices like computer to switch or computer to router to use straight cable.
When connecting two computers, use cross-over. Cross-over is required to connect the transmit and receive terminals of the two endpoints. When connecting through a router, switch or hub, use straight-through. The router, switch or hub provides the crossover.
It's a type of computer cable where some of the strands inside are "crossed over" compared to a "straight through" cable. You only need a crossover cable if you are connecting a computer directly to another computer. If you are connecting a computer to any other device like a switch, or a router, then you use a straight through cable, which are easier to find and cheaper. You can google for a crossover cable and it will show you a picture of which pins are crossed over.
To connect two devices of the same type together. e.g. You would use a crossover cable to connect a router to another router, a switch to another switch or a computer to another computer. If you are connecting diferent devices together, such as a router to a switch, a straight through cable should be used.
Crossover Games only lets you play games. Regular Crossover lets you run applications. Crossover Pro lets you run both.