The various wiring schemes for UTP are:
CAT1 which is used for telephone wire. CAT2 supports speeds up to 4 Mbps and used frequently for token ring networks.
CAT3 and CAT4 are both used for Token Ring networks for higher network speeds.
CAT5 wire is now replaced by the CAT5e designs providing an enhanced crosstalk specification allowing it to support speeds up to 1 Gbps.
It is the most used network cabling specification in the world.
CAT6 support speeds of 1 Gbps for lenght up to 100 meters and 10 Gbps up to 55 meters. Organizations using CAT6 cabling should use a spcialized cable analyzer to request a complete test report, to ensure that the CAT6 guidelines and standards have been followed during the installation.
The CAT7 is a fresh copper cable pattern which can support speeds of 10Gbps and length up to 100 meters.