local exchange


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local exchange

[′lō·kəl iks′chānj]
(communications)

central office

A local telephone company switching center. There are two types of central offices (COs). The first is called an "end office" (EO) or "local exchange" (LE) and connects directly to the outside plant, which is the feeder and distribution system to homes and offices. The end office (often called a "Class 5 office") provides customer services such as call waiting and call forwarding.

Tandem/Toll Office
The second type is the tandem office (also toll office or tandem/toll office), which is a central office that does not connect directly to the customer. Toll call record generation and accounting used to be handled in the tandem offices. Today, the billing is mostly done in the end offices. There are more than 25,000 central offices in the U.S. See LEC, IXC and LATA.



Central Offices
End offices provide the local loops directly to customers, while tandem offices carry traffic between end offices. The PSTN is made up of local exchange carriers (LECs) and interexchange carriers (IXCs) that are governed by LATA boundaries.


Central Offices
End offices provide the local loops directly to customers, while tandem offices carry traffic between end offices. The PSTN is made up of local exchange carriers (LECs) and interexchange carriers (IXCs) that are governed by LATA boundaries.






Central Offices
End offices provide the local loops directly to customers, while tandem offices carry traffic between end offices. The PSTN is made up of local exchange carriers (LECs) and interexchange carriers (IXCs) that are governed by LATA boundaries.








High-Tech Switching in the 19th Century
This "central office" was used to switch phone calls between all the lawyers in Richmond, Virginia in 1882. (Image courtesy of AT&T.)
References in periodicals archive ?
Rural local exchange carriers have dedicated substantial resources to providing wireless service to their customers.
Norlight is a competitive local exchange carrier that serves about 5,500 small and medium-sized business customers primarily in the Midwest.
19, the Florida PSC approved a proposed rule regarding an incumbent local exchange carrier's (ILECs) petition for relief from its COLR obligations.
To encourage entry possibilities associated with these options, the act mandated interconnection of networks, thus opening the possibility of facilities-based local exchange competition.
Video-over-DSL will be the new kid on the block, with US incumbent local exchange carriers (ILECs) and competitive local exchange carriers (CLECs) charging ahead with aggressive deployments to fend-off cable's triple play offering.
What is about to change is that their shared telecom department is about to become a Competitive Local Exchange Carrier (CLEC)--in essence, its own local dial-tone provider.
The company said that as a result of passing the milestone it was cutting its "trigger levels" - the number of customers in an area expressing an interest in broadband needed for it to be cost effective for BT to upgrade their local exchange to offer the service.
The company said that as a result of passing the milestone, it was cutting its ``trigger levels'' - the number of customers in an area expressing an interest in broadband needed for it to be cost effective for BT to upgrade their local exchange to offer the service.
The company said that as a result of passing the milestone it was cutting its ``trigger levels'' - the number of customers in an area expressing an interest in broadband needed for it to be cost effective for BT to upgrade their local exchange to offer the service.
In Letter Ruling 200242021, the Service revoked Letter Ruling 200133008, in which it held that a communications company's payments to local exchange carriers (LECs) for line services and its sales of access to those services are exempt from the Sec.
As a result, customers, such as incumbent local exchange carriers (ILECs), competitive local exchange carriers (CLECs) and interexchange carriers (IXCs), will benefit from the low-cost, easy-to-implement database.

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