A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN) or large...

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

Guardian Exchange was an underground telephone exchange built in Manchester from 1954 to 1957. It was built together with the Anchor exchange in Birmingham...

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

Kingsway telephone exchange was a Cold War-era hardened telephone exchange underneath High Holborn in London. Initially built as a deep-level air-raid...

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

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

telephone systems took advantage of the exchange principle already employed in telegraph networks. Each telephone was wired to a telephone exchange established...

The AXE telephone exchange is a product line of circuit switched digital telephone exchanges manufactured by Ericsson, a Swedish telecom company. It was...

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

Central Telephone Exchange - 14 July 1980 Changi Telephone Exchange Geylang Telephone Exchange Hougang Telephone Exchange Jurong Telephone Exchange Jurong...

data record produced by a telephone exchange or other telecommunications equipment that documents the details of a telephone call or other telecommunications...

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...

telephone call or telephone conversation (or telcon), also known as a phone call or voice call (or simply a call), is a connection over a telephone network...

A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. It is designed...

invents the telephone switchboard exchange (later working with Edison). 9 October 1876: Bell makes the first two-way long-distance telephone call between...

it has capacity for approaching 100 million telephone numbers. The code is used at 170 telephone exchanges in and around Greater London as part of the...

push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones. Western...

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

20th century. The switchboard was an essential component of a manual telephone exchange, and was operated by switchboard operators who used electrical cords...

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...

Lantau Island Clearwater Bay – East Telephone Exchange Tower, 38 Clearwater Bay Road Causeway Bay – East Telephone Exchange Tower, 38 Leighton Road, Causeway...

its respective numbering plan area. The telephone number consists of a three-digit central office (or exchange) code and a four-digit station number. The...

The invention of the telephone was the culmination of work done by more than one individual, and led to an array of lawsuits relating to the patent claims...

or territory. All local telephone numbers within the four areas have eight digits, consisting (mainly) of a four-digit exchange code and a four-digit local...

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

public switched telephone network (PSTN). Landline services are traditionally provided via an analogue copper wire to a telephone exchange. Landline service...

an exchange-by-exchange basis for calls connected by manual operators. Subscriber numbers reflected demand in each area, with single digit telephone numbers...

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

Anchor Exchange was an underground, hardened telephone exchange built in Birmingham, England. Construction commenced in 1953 under the guise of building...