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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Emergency Number Professional: ENP: National Emergency Number Association: Master Exercise Practitioner: MEP: Federal Emergency Management Agency, Master Registered Public Safety Leader: RPSL: Association of Public-Safety Communications Officials-International: Certified Fire Executive: CFE: Texas Fire Chiefs Association [23] National Crime ...
Number 1 Electronic Switching System (Alcatel-Lucent) US 1FR: Flat rate service: US 2G: second-generation mobile telephone 2.5G: Enhanced 2G mobile telephone 3G: third-generation mobile telephone 4ESS Number 4 Electronic Switching System (Alcatel-Lucent) 4WTS: Four-wire termination set: US 5ESS Number 5 Electronic Switching System (Alcatel ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, originally termed International Codes by the International Telegraph and Telephone Consultative Committee (C.C.I.T.T.) in 1960, [1] but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone ...
The most commonly known examples are emergency telephone numbers such as 9-9-9, 1-1-2 and 9-1-1.Other services may also be available through abbreviated dialing numbers, such as the other of the eight N11 codes of the North American Numbering Plan (NANP) besides 9-1-1. [1]
EAI—Enterprise Application Integration; EAP—Extensible Authentication Protocol; EAS—Exchange ActiveSync; EBCDIC—Extended Binary Coded Decimal Interchange Code; EBML—Extensible Binary Meta Language
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Number of Members Affected Duration of Strike Notes 1955: Southern Bell Telephone Co. 50,000: 72 days: Strike was in answer to management's effort to prohibit workers from striking. An expensive strike due to significant number of illegal firings and civil suits from Southern Bell.