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A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [ 1] It is designed to reproduce speech of a quality that is understandable. [ 2] It is the physical wire or other signaling medium connecting the user's telephone apparatus to the telecommunications network ...
A line isolation transformer for telephone use is a special type of impedance matching transformer that is used to couple telephone land lines to subscriber equipment to prevent dangerous common mode voltages from appearing on the line. It has a specific 600Ω input impedance which matches the telephone equipment. [1] A "wet" type will maintain ...
A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call . The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail .
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Added to NRHP. April 04, 1996 [1] The Polebridge to Numa Ridge Phoneline is a historic communications path in Glacier National Park in the U.S. state of Montana. The line was the last remaining single-line crank telephone network in the American West. The remaining line, insulators, and terminals are instructive of early communication technology.
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