The equipment room houses core network components, including servers, routers, switches, and PBXs. It serves as the central distribution point for the structured cabling system, often containing fiber distribution frames (FDFs) and patch panels. The communications connection to the outside world comes into the building through what is called a "service entrance" and is terminated in the main "equipment room" or "main cross connect" which houses the electronic communications equipment which connects to the outside world. It serves as a neutral. Today's premises cabling standards define cabling systems, using both copper and fiber optic cables, that can support premises networks called LANs for "local area networks" from 10 megabits per second to 10 gigabits per second over 100 meter distances. " Distributor C: Initial or central connection point in a hierarchical star topology.
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