|  | 8.2 | Planning Structured Cabling: Wiring Closet Specifications
| 8.2.2 | Size
TIA/EIA-568-A specifies that, in an Ethernet LAN, the horizontal cabling runs must be attached to a central point in a star topology. The central point is the wiring closet, and is where the patch panel and the hub must be installed. The wiring closet must be large enough to accommodate all of the equipment and wiring that will be placed in it, and include extra space to accommodate any future growth. Naturally, the size of the closet will vary with the size of the LAN, and the types of equipment required to operate it. A small LAN needs only a space the size of a large filing cabinet, while a massive LAN requires a whole room. TIA/EIA-569 specifies that each floor must have a minimum of one wiring closet and that additional wiring closets should be provided for each 1,000 m2, when the area of the floor that is served exceeds 1,000 m2, or the horizontal cabling distance exceeds 90 m.
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