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Panel Switch
The Panel Machine Switching System is a type of automatic telephone exchange for urban service that was used in the Bell System in the United States for seven decades. The first semi-mechanical types of this design were installed in 1915 in Newark, New Jersey, and the last were retired in the same city in 1983. The Panel switch was named for its tall panels which consisted of layered strips of terminals. Between each strip was placed an insulating layer, which kept each metal strip electrically isolated from the ones above and below. These terminals were arranged in ''banks'', five of which occupied an average selector frame. Each bank contained 100 sets of terminals, for a total of 500 sets of terminals per frame. At the bottom, the frame had two electric motors to drive sixty selectors up and down by electromagnetically controlled clutches. As calls were completed through the system, selectors moved vertically over the sets of terminals until they reached the desired location, at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panel Switch District Selector
Panel may refer to: Arts and media Visual arts *Panel (comics), a single image in a comic book, comic strip or cartoon; also, a comic strip containing one such image *Panel painting, in art, either one element of a multi-element piece of art, such as a triptych, a piece of sequential art such as a graphic novel or comic strip, or a wooden panel used to paint a picture on *Groupings of rock art#Motifs and panels, rock art, pictographs or petroglyphs Television *The Panel (Australian TV series), ''The Panel'' (Australian TV series), an Australian talk show *The Panel (Irish TV series), ''The Panel'' (Irish TV series), an Irish talk show * Panel game, a form of game show involving a group of celebrities Law * Judicial panel, set of judges who sit to hear a cause of action * Jury panel, body of people convened to render a judicial verdict * ''Panel'', or ''pannel'', in Scotland, formal term in solemn proceedings for an accused person; see Indictment People *Brice Panel (bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strowger Automatic Telephone Exchange Company
Automatic Electric Company (A.E. Co.) was an American telephone equipment supplier primarily for independent telephone companies in North America, but also had a worldwide presence. With its line of automatic telephone exchanges, it was also a long-term supplier of switching equipment to the Bell System, starting in 1919. The company was the largest manufacturing unit of the Automatic Electric Group.GTE Automatic Electric (1955) ''This is Automatic Electric--Pioneers in Communication Techniques'' In 1955, the company was acquired by General Telephone and Electronics (GT&E). After numerous reorganization within GTE, the companies assets it came under the umbrella of Lucent in the 1990s, and subsequently part of Nokia. History In 1889, Almon Strowger, of Kansas City, Missouri, was inspired by the idea of manufacturing automatic telephone exchanges that would not require switchboard operators. He founded the Strowger Automatic Telephone Exchange Company in 1891, which held the fir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Automatic Number Identification
Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System, eliminating the need for telephone operators to manually record calls. Modern ANI has two components: information digits, which identify the class of service, and the calling party billing telephone number. The term is also used to describe the functions of two-way radio selective calling that identify the transmitting user. ANI is distinct from newer caller ID services, such as call display, which are solely for informing a subscriber. Toll-free telephone numbers Modern toll-free telephone numbers, which generate itemized billing of all calls received instead of relying on the special fixed-rate trunks of the Bell System's original Inward WAT ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Direct Distance Dialing
Direct distance dialing (DDD) is a telecommunication service feature in North America by which a caller may, without operator assistance, call any other user outside the local calling area. Direct dialing by subscribers typically requires extra digits to be dialed as prefixes to the directory telephone number of the destination. International Direct Distance Dialing (IDDD) extends the system beyond the geographic boundaries of the North American Numbering Plan (NANP). History The first direct-dialed long-distance telephone calls were possible in the New Jersey communities of Englewood and Teaneck. Customers of the ENglewood 3, ENglewood 4 and TEaneck 7 exchanges, who could already dial telephone numbers in the New York City area, could place calls to eleven major cities across the United States by dialing the three-digit area code and the seven-digit directory number. Local telephone numbers still consisted of the first two letters of the central office name and five digits. On ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metering Pulse
In telecommunications, metering pulses are telephone signals sent by telephone exchanges to metering boxes and payphones aimed at informing the latter of the cost of ongoing telephone calls. Metering pulses are also known as ''billing pulses'' and ''tax pulses''. The properties of metering signals differ between the telephone administrations in various countries. Some systems use alternating current pulses superimposed on the direct current (battery) levels of the local loop, while others may use a reversal of tip-ring polarity of the wire pair. Common frequencies of the A.C. pulses are 50 Hz, 12 kHz, and 16 kHz, with typical durations of the signal varying from several tens to hundreds of milliseconds. 50 Hz pulses are applied to the telephone circuit as common-mode signals with respect to ground, as applying them differentially would make them audible for the talking parties as buzzing tones. The pulse amplitude (RMS voltage) is high enough to distinguish them from sign ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flat Rate
A flat fee, also referred to as a flat rate or a linear rate refers to a pricing structure that charges a single fixed fee for a service, regardless of usage. Less commonly, the term may refer to a rate that does not vary with usage or time of use. Advantages * A business can develop a dependable stance in a market, as consumers have a well-rounded price before the service is undertaken. For instance, a technician may charge $150 for his labor. * Potential costs can be covered. The service may result in inevitable expenses like the parts needed to fix the issue or the items required to complete the order. * No restricted structure is needed, as the pricing system can be adjusted to suit the business using it. Management can thus work out the pricing that best matches the company's objectives, efforts, costs, etc. Disadvantages * The fixed pricing restricts the company's capability to meet the needs of individual consumers, and people search for cheaper alternatives. * Pricing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
