Various national and international committees, such as ElA, TIA, and IEEE, have introduced some wiring standards. These committees have explained various electrical communication definitions, such as the process to inter-connect devices, the signals to be formed, and the designing and building equipment to assure characteristics in the market. In addition to these committees, some manufacturers of the communication equipment, such as IBM and Digital Equipment Corporation (DEC), have built their own standards. The different types of wiring standards are as follows:
568A is a telecommunication standard. This standard specifies the pin arrangements for the RJ-45 connectors (a LAN connector that has eight pins) on twisted-pair cables. The twisted-pair cables are preferred as these prevent crosstalk. The number 568 specifies the order in which twisted-pair cable wires are arranged and connected to the connector.
568B is a new telecommunication standard. This standard is quite similar to 568A standard. The only difference between these standard is in the arrangement.