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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 ...
In the United States, the modern demarcation point is a device defined by FCC rules (47 C.F.R. Part 68) [ 1] to allow safe connection of third-party telephone customer-premises equipment and wiring to the Public Switched Telephone Network (PSTN). The modern demarcation point is the network interface device (NID) or intelligent network interface ...
Network interface device. In telecommunications, a network interface device ( NID; also known by several other names) is a device that serves as the demarcation point between the carrier's local loop and the customer's premises wiring. Outdoor telephone NIDs also provide the subscriber with access to the station wiring and serve as a convenient ...
Plain Old Telephone Service ( POTS ), or Plain Ordinary Telephone System, [ 1] is a retronym for voice-grade telephone service employing analog signal transmission over copper loops. Originally POTS stood for Post Office Telephone Service as early phone lines in most parts of the world were operated directly by the local Post Office.
A line-replaceable unit ( LRU[ 1] ), lower line-replaceable unit ( LLRU ), [citation needed] line-replaceable component ( LRC ), or line-replaceable item ( LRI) [ 2] is a modular component of an airplane, [ 3] ship or spacecraft [ 4] (or any other manufactured device) that is designed to be replaced quickly at an operating location (1st line).
1,200,000 [ 2] Content license. Creative Commons BY-NC-SA [ 3] Website. ifixit.com. iFixit ( / aɪˈfɪksɪt / eye-FIX-it[ 4]) is an American e-commerce and how-to website that sells repair parts and publishes free wiki -like online repair guides for consumer electronics and gadgets. The company also performs product tear-downs of consumer devices.
Beige boxes can be usually constructed with easily available materials, such as a simple "POTS" telephone, a soldering iron, and a pair of alligator clips.Sometimes a switch is added in order to turn the microphone off (mute), so as not to introduce ambient noise into the line through the telephone's microphone.
A survival kit is a package of basic tools and supplies prepared as an aid to survival in an emergency. Civil and military aircraft, lifeboats, and spacecraft are equipped with survival kits. Survival kits, in a variety of sizes, contain supplies and tools to provide a survivor with basic shelter against the elements, help them to keep warm ...
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