Use a crossover cable when connecting the same type of network device.
For two devices to communicate through a cable that is directly connected between the two, the transmit terminal of one device needs to be connected to the receive terminal of the other device.
The cable must be terminated so the transmit pin, Tx, taking the signal from device A at one end, is wired to the receive pin, Rx, on device B. Similarly, device B's Tx pin must be connected to device A's Rx pin. If the Tx pin on a device is numbered 1, and the Rx pin is numbered 2, the cable connects pin 1 at one end with pin 2 at the other end. These "crossed over" pin connections give this type of cable its name, crossover
To achieve this type of connection with a UTP cable, one end must be terminated as EIA/TIA T568A pinout, and the other end terminated with T568B pinout.
Note:
Use crossover cables to directly connect the following devices on a LAN:
a. Switch to Switch
b. Switch to Hub
c. Hub to Hub
d. Router to Router Ethernet port connection
e. Computer to Computer
f. Computer to a Router Ethernet port
Crossover cables have a T568A Terminationat one end ans a T568B at the other end.
