Demarc extension
Encyclopedia
In telecommunications, a demarc extension is the transmission path originating from the interface of the access provider's side of a telecommunications circuit demarcation point
within a premise 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 transmission path to the edge CPE.
A demarc extension may also be referred to as inside wiring, extended demarc, circuit extension, CPE cabling and riser cabling.
as well as the supplemental FCC rulings of 1991, 1996
and 1997. Preceding these rulings, the Bell System Companies held a monopoly and did not allow an interconnection
with third party equipment. The incumbent local exchange carrier
s (ILEC) and other local access providers are now mandated by federal law to provide a point where the operational control or ownership changes. This separation between the local access provider and the end user/subscriber is called the demarcation point within a facility (typically a short distance from the minimum point of entry). This then becomes the responsibility of the end user to extend their service to the CPE location within a facility to provide connectivity for service, requiring a demarc extension.
Demarcation point
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...
within a premise and ending at the termination point prior to the interface of the edge Customer Premises Equipment
Customer-premises equipment
Customer-premises equipment or customer-provided equipment is any terminal and associated equipment located at a subscriber's premises and connected with a carrier's telecommunication channel at the demarcation point...
(CPE). This may include in-segment equipment, media converters and patch cords as required to complete the circuit's transmission path to the edge CPE.
A demarc extension may also be referred to as inside wiring, extended demarc, circuit extension, CPE cabling and riser cabling.
History
A demarc extension became an important factor to consider in a building's telecommunications infrastructure after the 1984 deregulation of AT&TBell System divestiture
The Bell System divestiture, or the breakup of AT&T, was initiated by the filing in 1974 by the U.S. Department of Justice of an antitrust lawsuit against AT&T. The case, United States v...
as well as the supplemental FCC rulings of 1991, 1996
Telecommunications Act of 1996
The Telecommunications Act of 1996 was the first major overhaul of United States telecommunications law in nearly 62 years, amending the Communications Act of 1934. This Act, signed by President Bill Clinton, was a major stepping stone towards the future of telecommunications, since this was the...
and 1997. Preceding these rulings, the Bell System Companies held a monopoly and did not allow an interconnection
Interconnection
In telecommunications, interconnection is the physical linking of a carrier's network with equipment or facilities not belonging to that network...
with third party equipment. The incumbent local exchange carrier
Incumbent local exchange carrier
An ILEC, short for incumbent local exchange carrier, is a local telephone company in the United States that was in existence at the time of the breakup of AT&T into the Regional Bell Operating Companies , also known as the "Baby Bells." The ILEC is the former Bell System or Independent Telephone...
s (ILEC) and other local access providers are now mandated by federal law to provide a point where the operational control or ownership changes. This separation between the local access provider and the end user/subscriber is called the demarcation point within a facility (typically a short distance from the minimum point of entry). This then becomes the responsibility of the end user to extend their service to the CPE location within a facility to provide connectivity for service, requiring a demarc extension.