The standards categories
| Category | Maximum data rate | Usual application |
|---|---|---|
| CAT 1 (de facto name, never a standard) | Up to 1 Mbps (1 MHz) | analog voice (POTS) Basic Rate Interface in ISDN Doorbell wiring |
| CAT 2(de facto name, never a standard) | 4 Mbps | Mainly used in the IBM cabling system for Token Ring networks |
| CAT 3 | 16 Mbps | Voice (analog most popular implementation) 10BASE-T Ethernet |
| CAT 4 | 20 Mbps | Used in 16 Mbps Token Ring, otherwise not used much. Was only a standard briefly and never widely installed. |
| CAT 5 | 100 MHz | 100 Mbps TPDDI 155 Mbps ATM No longer supported; replaced by 5E. 10/100BASE-T 4/16MBps Token Ring Analog Voice |
| CAT 5E | 100 MHz | 100 Mbps TPDDI 155 Mbps ATM Gigabit Ethernet Offers better near-end crosstalk than CAT 5 |
| CAT 6 | Up to 250 MHz | Minimum cabling for data centers in TIA-942. Quickly replacing category 5e. |
| CAT 6E | (field-tested to 500 MHz) | Support for 10 Gigabit Ethernet (10GBASE-T) May be either shielded (STP, ScTP, S/FTP) or unshielded (UTP) This standard published in Feb. 2008. Minimum for Data Centers in ISO data center standard. |
| CAT 7 (ISO Class F) | 600 MHz 1.2 GHz in pairs with Siemon connector | Full-motion video Teleradiology Government and manufacturing environments Fully Shielded (S/FTP) system using non-RJ45 connectors but backwards compatible with hybrid cords. Until February 2008, the only standard (published in 2002) to support 10GBASE-T for a full 100m. |
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