Most Common Twisted-pair Cables
| Name | Type | Bandwidth | Applications | Notes |
| Level 1 | 0.4 MHz | Telephone and modem lines | Not described in EIA/TIA recommmendations. Unsuitable for modern systems. | |
| Level 2 | 4 MHz | Older terminal systems, e.g. IBM 3270 | Not described in EIA/TIA recommmendations. Unsuitable for modern systems. | |
| Cat3 | UTP | 16 MHz | 10BASE-T and 100BASE-T4 Ethernet | Described in EIA/TIA-568. Unsuitable for speeds above 16 Mbit/s. Now mainly for telephone cables |
| Cat4 | UTP | 20 MHz | 16 Mbit/s Token Ring | Not commonly used |
| Cat5 | UTP | 100 MHz | 100BASE-TX & 1000BASE-T Ethernet | Common in most current LANs |
| Cat5e | UTP | 100 MHz | 100BASE-TX & 1000BASE-T Ethernet | Enhanced Cat5. Same construction as Cat5, but with better testing standards. |
| Cat6 | UTP | 250 MHz | 10GBASE-T Ethernet | Most commonly installed cable in Finland according to the 2002 standard. SFS-EN 50173-1 |
| Cat6a | 500 MHz | 10GBASE-T Ethernet | ISO/IEC 11801:2002 Amendment 2. | |
| Class F | S/FTP | 600 MHz | Telephone, CCTV, 1000BASE-TX in the same cable. 10GBASE-T Ethernet. | Four pairs, S/FTP (shielded pairs, braid-screened cable). Development complete - ISO/IEC 11801 2nd Ed. |
| Class Fa | 1000 MHz | Telephone, CATV, 1000BASE-TX in the same cable. 10GBASE-T Ethernet. | Four pairs, S/FTP (shielded pairs, braid-screened cable). Development complete - ISO/IEC 11801 2nd Ed. Am. 2. |
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