![]() The "FX line" is usually treated as part of the distant city when originating calls to N11-style numbers, such as information or emergency telephone numbers. An Oshawa business may lease an FX line from suburban Ajax as that community is local to both Toronto and Oshawa, even though Ajax does not have the full Toronto calling area. ![]() If the business is located just outside the larger city's local calling area, an FX number in the next-closer suburb would provide a limited coverage of the city.Adding an FX line with a Toronto +1-416 number would provide full coverage. If the business is in an adjacent suburb (such as Mississauga or Markham) a local number will reach the city but not the suburbs on the other side.As an "FX line" has a number from the neighboring city, it has the city calling area for both incoming and outbound calls.įor instance, a suburban business may want to market extensively to Toronto, a large city with flat-rate local calling: In many areas, local flat-rate service was subsidized by long-distance toll service for much of the 20th century. Ī subscriber located just outside the exchange boundary of a large city, or just outside the flat-rate local calling area for the city, would find that many numbers which would have been local from the city itself became long-distance. Function Īn FX line has the local calling area of the foreign exchange in which it is numbered. Much like FX service rates depend on the distance between rate centers, FCO service prices depend on the distance between exchanges. They differ only in that the remote office is in exactly the same rate centre (FCO) or merely in a different zone of the same US metropolitan city (FZ). The practice, rare except in big cities, is in decline.įoreign central office (FCO) or foreign zone (FZ) services were, from a technological standpoint, deployed with the same methods as foreign exchange (FX). With two-wire loop technology, this typically required an engineered circuit with increased costs. The office names were changed to three-digit numerical central office codes (NXX), prefixed to the local telephone number.Ĭustomers who wanted a telephone number provided by a neighboring or remote telephone central office leased a "foreign exchange" line. Until the 1960s, central offices usually had names, derived from locally distinct geographic or historical contexts. ![]() ![]() ![]() Each central office has a unique identifier. A local office is assigned a specific area, and all telephone services provided to that area originate from that central office. Basic telephony terminology distinguishes two types of offices: local and foreign. ![]()
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