Dial Tone Speed

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• Dual-tone multi-frequency signaling — One of the few production telephone DTMF keypads with all 16 keys, from an Autovon Telephone. The column of red keys produces the A, B, C, and D DTMF events. Dual tone multi frequency signaling (DTMF) is used for telecommunication signaling over… …   Wikipedia

• Film speed — is the measure of a photographic film s sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital… …   Wikipedia

• Diversi-Dial — Diversi Dial, or DDial was an online chat server that was popular during the mid 1980s. It was a specialized type of bulletin board system that allowed all callers to send lines of text to each other in real time, operating at 300 baud. In some… …   Wikipedia

• Stromberg-Carlson — This article is about Stromberg Carlson, the American telephone equipment manufacturing company. For the phone phreak with a similar name, see Strom Carlson. Stromberg Carlson was a telecommunications equipment manufacturing company formed in… …   Wikipedia

• telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… …   Universalium

• Hayes command set — The Hayes command set is a specific command language originally developed for the Hayes Smartmodem 300 baud modem in 1981. The command set consists of a series of short text strings which combine together to produce complete commands for… …   Wikipedia

• GPO telephones — The United Kingdom s General Post Office (GPO) had a number of telephones that were provided by them for connection to their exchanges. Until 1982 the GPO had a monopoly on the provision of all telephones within the UK and so the range was… …   Wikipedia

• Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… …   Wikipedia

• Improved Mobile Telephone Service — The Improved Mobile Telephone Service (IMTS) is a 0G pre cellular VHF/UHF radio system that links to the PSTN. IMTS was the radiotelephone equivalent of land dial phone service. It was introduced in 1969 as a replacement to Mobile Telephone… …   Wikipedia

• 9-1-1 — This article is about the emergency telephone number. For other uses, see 911 (disambiguation). See also: Emergency telephone number Emergency 911 displayed on the side of an emergency vehicle, indicating that 9 1 1 is the number to dial in the… …   Wikipedia

• Plain old telephone service — (POTS) is the voice grade telephone service that remains the basic form of residential and small business service connection to the telephone network in most parts of the world. The name is a reflection of the telephone service still available… …   Wikipedia