In telecommunication, on-premises wiring is customer-owned communications transmission lines. It is also called customer premises wiring (CPW). The transmission lines can be metallic (copper) or optical fiber, and may be installed within or between buildings.
Premises wiring may consist of horizontal wiring, vertical wiring, and backbone wiring. It may extend from the point-of-entry to user work areas. Any type of communications or information technology wiring will be considered premises wiring, including telephone, computer/data, intercom, closed-circuit television, etc.
Premises networks are wired worldwide, across every industry, in both small and large scale applications. Any type or number of topologies may be used -- star, bus, ring, etc.
Read more about On-premises Wiring: Ownership