|  | 8.5 | Planning Structured Cabling: Horizontal and Backbone Cabling
| 8.5.5 | Backbone cabling media
TIA/EIA-568-A specifies four types of networking media that can be used for backbone cabling. These include: 100 W UTP (four-pair) 150 W STP-A (two-pair) 62.5/125 µ optical fiber single-mode optical fiber Although TIA/EIA-568-A recognizes 50 W coaxial cable, generally, it is not recommended for new installations, and it is anticipated that it will be removed as a choice the next time the standard is revised. Most installations today use the 62.5/125 µ fiber-optic cable, as a matter of course, for backbone cabling.
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