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== Wiring termination ==
The simplest NIDs are essentially just a specialized set of wiring [[terminal (electronics)|terminal]]s. These will typically take the form of a small, weather-proof box, mounted on the outside of the building. The [[telephone line]] from the [[telephone company]] will enter the NID and be connected to one side. The customer connects their wiring to the other side. A single NID enclosure may contain termination for a single line or multiple lines.
In its role as the demarcation point (dividing line), the NID separates the telephone company's equipment from the customer's wiring and equipment. The telephone company owns the NID itself, and all wiring up to it. Anything past the NID is the customer's responsibility. To facilitate this, there is typically a test jack inside the NID. Accessing the test jack disconnects the customer premises wiring from the [[public switched telephone network]] and allows the customer to plug a "known good" [[telephone]] into the jack to isolate trouble. If the telephone works at the test jack, the problem is the customer's wiring, and the customer is responsible for repair. If the telephone does not work, the line is faulty and the telephone company is responsible for repair.
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