|  | 8.5 | Planning Structured Cabling: Horizontal and Backbone Cabling
| 8.5.4 | Cabling for MDF and IDF connections
The type of cabling that TIA/EIA-568 specifies for connecting wiring closets to each other, in an Ethernet LAN extended star topology, is called backbone cabling. Sometimes - to differentiate it from horizontal cabling - you may see backbone cabling referred to as vertical cabling. Backbone cabling consists of the following: backbone cabling runs intermediate and main cross-connects mechanical terminations patch cords used for backbone-to-backbone cross-connections vertical networking media between wiring closets on different floors networking media between the MDF and the POP networking media used between buildings in a multi-building campus
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| Cabling Glossary
| Industry Standards for Structured Cabling