![]() Each operator sat in front of from one to three banks of ¼-inch phone jacks fronted by several rows of phone cords, each of which was the local termination of a phone subscriber line. Later exchanges consisted of one to several hundred plug boards manned by operators. The switchboard was built from "carriage bolts, handles from teapot lids and bustle wire" and could handle two simultaneous conversations (see National Park Service ()). The first telephone exchange opened in New Haven, Connecticut in 1878. (Telephone switchboard photograph courtesy of JoeTourist InfoSystems ()) In the United States, the word exchange can also have the technical meaning of a local access and transport area under the Modification of Final Judgment (MFJ).Ī telephone operator manually onnected calls with patch cables at a telephone switchboard. The United Kingdom never adopted the two-letter, five-number format, remaining with the three-letter, four-number format until converting to all-numeric phone numbers in 1968. ![]() In 1961, New York Telephone introduced "selected-letter" exchanges, in which the two letters did not mark the start of any particular name (example: FL 6-9970), and by 1965 all newly-connected phone numbers nationwide consisted of numerals only (Wichita Falls, Texas had been the first locality in the United States to implement the latter, having done so in 1958 meanwhile, pre-existing numbers continued to be displayed the old way in many places well into the 1970s). In 1955, the Bell System attempted to standardize the process of naming exchanges by issuing a "recommended list" of names to be used for the various number combinations. Prior to the mid-1950s, the number immediately following the name could never be a "0" or "1 " indeed, "0" was never pressed into service at all, except in the immediate Los Angeles area (the "BEnsonhurst 0" exchange mentioned in an episode of the popular TV sitcom The Honeymooners was fictitious). In December of 1930, New York City became the first locality in the United States to adopt the two-letter, five-number format it remained alone in this respect until after World War II, when other municipalities across the country began to follow suit (in some areas, most notably much of California, telephone numbers in the 1930s and early 1940s consisted of only six digits, two letters which began the exchange name followed by four numbers, as in DUnkirk 0799). 869–1234 was formerly TOwnsend 9–1234, and before that (in some localities) might have been TOWnsend 1234 (only the capital letters and numbers being dialed). In the past, the first two or three digits would map to a mnemonic exchange name, e.g. And more narrowly, it can refer to the first three digits of the local number. The term exchange can also be used to refer to an area served by a particular switch. It is what makes your phone calls "work" in the sense of making connections and relaying the speech information. In the field of telecommunications, a telephone exchange (US: telephone switch) is a piece of equipment that connects phone calls. A workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication. A central system of switches and other equipment that establishes connections between individual telephones. ![]() Definition: Telephone Exchange: Telecom Dictionary - Phone Service DefinitionsĮnglish | Español | Français Telecom Dictionary - Definitions of terms A B C D E F G H I J K L M N O P Q R S T U V W X Y Z T Telephone Exchange - Synonym for central office.
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