A telephone exchange name or central office name was a distinguishing and memorable name assigned to a central office. It identified the switching system...

A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network...

the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange. The exchange completes the call...

Anchor Exchange is an underground telephone switching system and former hardened telephone exchange built in Birmingham, England. Construction commenced...

London had a large network of manual exchanges (80 in 1927) and individual telephone exchanges were given names, e.g. Ebbsfleet; a caller asked the operator...

convention of using telephone exchange names. Before "555" or "KLondike-5" gained broad usage, scriptwriters would sometimes invent fake exchanges starting with...

(KTS) to the private branch exchange (PBX). A business telephone system differs from an installation of several telephones with multiple central office...

leading letters of telephone exchange names. In the mid-20th century United States, before the switch to All-Number Calling, telephone numbers had seven...

traditional system of using initial letters of telephone exchange names as the first part of a telephone number. The change affected subscriber numbers in the...

A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony...

switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords...

dialing. It is used when initiating a telephone call to transmit the destination telephone number to a telephone exchange. On the rotary dial, the digits are...

a toll call. Despite the abandonment of telephone exchange names in telephone numbering plans, many telephone dials and keypads maintain a tradition of...

the now-defunct use of telephone exchange names in telephone numbers. In this case, the significant portions of the exchange name were the first two letters...

with telephone exchange names followed by digits, such as in the telephone number "PEnnsylvania 6-5000". The letter Z appeared on many telephone dials...

electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon...

Telephone numbers in Japan consist of an area code, an exchange number, and a subscriber number. 001, 00xx, 002xx, 0091xx Carrier selection prefix 184...

of the telephone chronicles the development of the electrical telephone, and includes a brief overview of its predecessors. The first telephone patent...

The Pacific Bell Telephone Company (Pac Bell) is a telephone company that provides telephone service in California. The company is owned by AT&T through...

location, potentially limiting the available choices based on which telephone exchanges serve a local area. The main advantages of phonewords over standard...

The Nippon Telegraph and Telephone Corporation (NTT) (Corporate Number: 7010001065142) is a Japanese telecommunications holding company headquartered...

modern day usage, "foreign exchange office" (FXO) and "foreign exchange station" (FXS) refer to the different ends of a telephone line in the context of voice...

national dialling codes. Exchange names were usually closely tied to the physical location of telephone exchanges, being either the name of a city, town or...

Hungarian engineer Tivadar Puskás proposed the telephone switch, which allowed for the formation of telephone exchanges, and eventually networks. In the United...

number may have different lengths. It shows which exchange the remaining numbers refer to. A full telephone number is usually made up of a country code (required...

A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers...

"BUtterfield 8" is the number of a telephone exchange for an answering service that follows the pattern of old telephone exchange names in the United States and...

larger cities. In large cities, each central office had one or more telephone exchange names. In the 2L+5N system, used only in large cities, a seven-digit...

telegraph and telephone services). Telecommunications companies are common carriers, and in the United States are also known as local exchange carriers. With...

series to have the Bunkers and other characters use telephone exchange names when giving a telephone number. Most other series at the time, such as The...