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...

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

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

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

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

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

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

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

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...

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...

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...

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

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...

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

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...

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

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...

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

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

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...

telephone exchange provided the solution for establishing telephone connections with any other telephone in service in the local area. Each telephone...

A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized...

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

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...

An incumbent local exchange carrier (ILEC) is a local telephone company which held the regional monopoly on landline service before the market was opened...

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...