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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network (PSTN) or in large enterprises. It facilitates the establishment of communication circuits, enabling telephone calls between subscribers.
Local exchange carrier (LEC) is a regulatory term in telecommunications for the local telephone company. In the United States , wireline telephone companies are divided into two large categories: long-distance ( interexchange carrier , or IXCs) and local (local exchange carrier, or LECs).
In the following states and regions, the primary local carrier is not an RBOC: Lumen Technologies, in addition to its role as the BOC in the areas of 14 states gained from its acquisition of Qwest, Lumen serves other non-ex-Bell local exchanges in those states, as well as some in Florida and the Las Vegas metropolitan area in Nevada.
An incumbent local exchange carrier is a local exchange carrier (LEC) in a specific area that on the date of enactment of the Telecommunications Act of 1996 , provided telephone exchange service on the date of enactment, was deemed to be a member of the National Exchange Carrier Association pursuant to the Code of Federal Regulations (C.F.R ...
This was the standard in most of North America from the 1950s onward. In some small villages with only one local exchange, it may have been permissible to dial only the four-digit station number. Even after exchange names were introduced, it was possible in many small cities to call local numbers by dialing only the five digits which followed.
Using LRN, when a telephone number has been dialed, the local telephone exchange queries or "dips" a routing database, usually the SCP, for the LRN associated with the subscriber number. The LRN removes the need for the public telephone number to identify the local exchange carrier. If a subscriber changes to another telephone service provider ...
Local telephone wires terminate at the central office (telephone exchange), a structure containing the hardware needed to switch calls among local lines and long-distance networks. Thus, when a call was placed by a customer outside the local calling area, the central office would switch the call to the respective long-distance network.