On-premises wiring (customer premises wiring) is customer-owned telecommunication transmission or distribution lines. The transmission lines may 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 cabling. It may extend from the point-of-entry to user work areas. Any type of communications or data wiring is considered premises wiring, including telephone, computer/data, intercom, closed-circuit television.
The ownership of on-premises wiring varies between jurisdictions: It depends on the location of the demarcation point. The location determines ownership and responsibility for maintenance and repair.
In the United States and Canada, most premises wiring is owned by the customer. There generally is a demarcation point "as close to the poles" as possible. For many installations, this is a network interface device mounted on the outside of the building. In some cases, it is a minimum-point-of-entry (MPOE) location inside the building.
- [tsp.ncs.gov/docs/TSPServiceUserManual.doc TSP Service User Manual, p 2-4] National Communications System 2000 May 5[dead link]
- "What is a Demarcation Point? - Definition from Techopedia". Techopedia.com. Retrieved 2018-02-05.
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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