|  | 8.5 | Planning Structured Cabling: Horizontal and Backbone Cabling
| 8.5.3 | Example of where you would use multiple wiring closets
Another example of a LAN that would probably require more than one wiring closet would be a multi-building campus. The main figure illustrates locations where backbone and horizontal cabling have been placed, in an Ethernet LAN, in just such a multi-building campus. It shows an MDF in the center of the campus. In this instance, the POP is located inside the MDF. The backbone cabling (red lines) runs from the MDF to each of the IDFs. The IDFs (yellow boxes) are located in each of the campus buildings. In addition, the main building has an IDF, as well as an MDF, so that all computers fall within the catchment area. Horizontal cabling, running from the IDFs and MDFs to the work areas, is represented by the blue lines.
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| Industry Standards for Structured Cabling