It connects the pins that are used for transmitting on one router to the pins that are used for receiving on the other router.
If you want to connect two routers with a wire you have use a straight lan cable NOT crossover cable.
Two equipments of the same type - two computers, two routers, two switches - should be connected with a crossover cable.
You need a crossover cable to connect two routers via normal Ethernet interfaces.
crossover cable is used to connect two switches.
To connect two Cisco 2600 series routers directly, you would typically use a crossover Ethernet cable if they are connected through their Ethernet interfaces. If connecting through serial interfaces, a serial cable (such as a DTE to DCE cable) would be appropriate. Ensure that the correct interface types are used for the connection type you are employing.
100BaseTX implies Cat5 or better RJ45 cables, and between two routers you need a crossover cable.
A crossover cable.
Either use a crossover cable or connect them using a hub, switch, or router.
Crossover cables are used when you are connecting two devices of the same type together. e.g. connecting two routers or two switches or two computers. A straight through cable is used to connect devices of different types. e.g. a computer to a switch or router. Using the correct cable is less important these days though as most networking devices have the capability to auto-sense what cable is being used and what cable is needed. The devices can simply change their configurations to whatever is needed to make the connections work. This technology is called Auto-MDIX (Media Dependant Interface Crossover).
Usually older Ethernet switches needed to be connected using a crossover cable. Now, most modern switches have auto-crossover feature that lets you use a straight Ethernet cable. You could also connect two computers using a crossover cable, but like with switches, most Ethernet interfaces on computers also support auto-crossover.
The difference between a cross cable and a state cable is that a cross cable, or crossover cable, is used specifically to connect two of the same devices.
The purpose of a crossover cable is to supply the output of one computer as the input to another. As such the most certainly can share their resources. This is done to:connecting two devices directly, output of one to input of the other without an intervening network connectionletting two terminal (DTE) devices communicate without an interconnecting hub knotlinking two or more hubs, switches, or routers together, possibly to work as one wider device.