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Typically, several six-digit (2L-4N) exchanges were co-located in one building already, with new ones added as old ones had filled up. After the conversion, they may have been combined into a new 2L-5N exchange area. For example, the CHerry, FIllmore, ATwater, and KLondike exchanges might be converted to OXford 1, 3, 6, and 7.
This system was referred to as 2L-5N, or simply 2-5. This plan was projected to be usable beyond the year 2000. This plan was projected to be usable beyond the year 2000. However, with increasing demand for telephone service in the post-war decades, it became apparent by the late 1950s, that the system would be outgrown by about 1975. [ 3 ]
PEnnsylvania 6-5000 is a telephone number in New York City, written in the 2L+5N (two letters, five numbers) format that was common from about 1930 into the 1960s. The number is best known from the 1940 hit song " Pennsylvania 6-5000 ", a swing jazz and pop standard recorded by the Glenn Miller Orchestra .
A telephone exchange, telephone switch, ... once numbers were standardized to the 2L-4N or 2L-5N format (two-letter exchange name and either four or five digits), ...
The network reorganization standardized this system to using a two-letter, five-digit (2L-5N) representation of telephone numbers in most exchanges in North America, [32] or to using an equivalent all-numeric seven-digit numbering plans, as was practiced by some telephone companies. [citation needed]
New York used the 3L-4N format from 1920, when dial telephones were first introduced there, until 1930, when it switched to 2L-5N. The original North American area codes were assigned in 1947 as routing codes for operator calls, but by 1951, the first cross-country Bell System direct distance dial was placed directly from a subscriber station.
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These were the first to be lengthened to 2L-5N in 1951–1953. 416-861 (UNiversity 1) was TRinity exchange in the Adelaide St (Queen West) area west of downtown (lengthened to 2L-5N in 1955). 416–921, 922, 923, 924 (WAlnut 1,2,3,4) were RAndolph, KIngsdale, MIdway and PRincess (lengthened to 2L-5N in 1954) in the Annex.