Capa do livro de Telephone Numbering Plan
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Telephone Numbering Plan

Betascript Publishing (2013-10-14 )

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A telephone numbering plan is a system of allocating and routing telephone numbers in a telephone network. A closed numbering plan, such as found in North America, features fixed length area codes and local numbers. An open numbering plan features variance in length of area code or local number, or both. The term dial plan should not be confused with numbering plan. In early telephone systems, connections were made in the central office by telephone operators using patch cords to connect one party to another. If a person wanted to make a phone call, he or she would pick up a phone and wind a crank on the side. The crank was a small generator that would light a lamp at the central office. An operator would see the light and insert their patch cord into a socket and assist the customer with the call connection. The operator would use patch cords to connect the caller to the person being called. If the party being called was in another exchange, the operator would use a patch cord to connect to another exchange where an operator elsewhere would finish the connection. As technology advanced, electro-mechanical switches were introduced and calls were made using "rotary dials".
Betascript Publishing
Editado por:
Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
Número de páginas:
Publicado em:
Eletrônicas, eletro-tecnologia, tecnologia da comunicação
39.00 €
Palavras chave:
Numbering Plan, Telephone Number, Telephone Operator, Cord Circuit, Rotary Dial, Telephone Exchange, International Telecommunication Union, Country Code, Dial plan

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