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A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence.
The only Calatravas earlier using a quartz movement were the 3744 (E27 movement, no date, no second hand) and 3944 (E23 movement, date, second hand). Some Calatravas (such as the 5227) feature a date function, whereas others (such as the 5116, 5119, 5120, 5123, 5196) display only hours and minutes and, in some cases, seconds (such as the 5026 ...
The vast majority of dial-up modems use the Hayes command set in numerous variations. The command set covered only those operations supported by the earliest 300 bit/s modems. When new commands were required to control additional functionality in higher speed modems, a variety of one-off standards emerged from each of the major vendors.
In its original form, from the 19th century until about 1950, the device usually consisted of a round dial about 9 inches (230 mm) in diameter with a knob at the center attached to one or more handles, and an indicator pointer on the face of the dial. There would also be a revolutions per minute (RPM) indicator, worked by a hand crank. Modern ...
A dial plan establishes the expected sequence of digits dialed on subscriber premises equipment, such as telephones, in private branch exchange (PBX) systems, or in other telephone switches to effect access to the telephone networks for the routing of telephone calls, or to effect or activate specific service features by the local telephone ...
In the 1970s and early 1980s, 1199011 was a number that when called would result in another dial tone. Afterwards, if the phone was hung up and then quickly picked up again in less than approximately 1/2 second (ie: a hook flash), a steady tone would then be heard (different from a regular dial tone). Hanging up the phone after this would ...
The Trimphone started life in 1964 as the Telephone No. 712, which was usually supplied as a 712L with an alphabetical as well as numerical dial. The Trimphone was the first in the GPO range to use a tone caller which warbled at around 2,350 Hz modulated by ringing current. The volume of the ringer gradually built up over the first few cycles.
The model 500 rotary dial telephone by Western Electric was a pulse-dialing instrument.. Pulse dialing is a signaling technology in telecommunications in which a direct current local loop circuit is interrupted according to a defined coding system for each signal transmitted, usually a digit.