Demarcation point

A demarcation point extension, or demarc extension is the transmission path originating from the interface of the access provider's side of a demarcation point within a premises and ending at the termination point prior to the interface of the edge Customer Premises Equipment (CPE). This may include in-segment equipment, media converters and patch cords as required to complete the circuit's ...

A demarcation point extension (demarc extension) is the process of connecting your customer-premises equipment (CPE) to the Public Switched Telephone Network (PSTN), as defined by the FCC. Cabling from the demarc must extend to a wiring closet or data distribution system to integrate with your network.

The demarcation point contains a surge suppressor to protect the wiring and connected equipment in a cutomer's home from external or internal damage. It also permits consumers to disconnect from the telephone company's wiring for troubleshooting. The demarcation point is also referred to as a network terminating interface or demarc.

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In telephony, the demarcation point is the point at which the public switched telephone network ends and connects with the customer's on-premises wiring. It is the dividing line which determines who is responsible for installation and maintenance of wiring and equipment -- customer/subscriber, or telephone company/provider.

My house is of almost the same age and has similar wiring inside and out. The inside punch-down block, in your second photo, is essentially the demarcation point. It predates the inclusion of a modular jack and plug as a demarcation point. The wires coming out of the black cable are Bell's side of the demarcation.

The FCC has determined separate demarcation points for wiring used for separate services; the demarcation point for video wiring is specified in 47 C.F.R. § 76.5(mm), and designates a location entirely different from that specified as the demarcation point for telephone wiring according to 47 C.F.R. § 68.105.

This page outlines some tips for wiring your location for DSL. Line filter at the demarcation point. In most homes there is a box or junction just inside where the Bell line enters your location. This is called the demarcation point. All the wiring inside the demarcation point, along with any associated problems, are owned by the building owner.

Every run of wire should start at the demarcation point or, if phone service has never been installed at your location, at a point close to the main electrical panel. A customer distribution device, or connector block, should be installed at this location. Leave approximately 1 metre (3 feet) of wire hanging at the demarcation point.

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