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for the building where the wires that go to telephone jacks throughout the building and wires that go to the exchange meet and can be connected in different configurations depending upon the subscribed telephone service. The wires between the junction box and the exchange are known as the
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Older houses often have 4-conductor telephone station cable in the walls color coded with Bell System colors: red, green, yellow, black as 2-pairs of 22 AWG (0.33 mm) solid copper; "line 1" uses the red/green pair and "line 2" uses the yellow/black pair. Inside the walls of the
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telephone service and digital subscriber line (DSL) phone cable service to the premises. Telephone overhead lines are connected to the public switched telephone network. The
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jacks. More often, only two of the wires are connected to the exchange as one telephone line, and the others are unconnected. In that case, the jacks in the house are
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at a subscriber's network interface is typically 48 V between the ring and tip wires, with tip near ground and ring at –48 V.
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which performed any necessary electrical switching to allow voice signals to be transmitted to more distant telephones.
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cables. Modern lines may run underground, and may carry analog or digital signals to the exchange, or may have
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system. It is designed to reproduce speech of a quality that is understandable. It is the physical
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Syllabus 4 Module 1 Basic Concepts of IT: European Computer Driving Licence
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Inside large buildings, and in the outdoor cables that run to the telephone company
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or other signaling medium connecting the user's telephone apparatus to the
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The vast majority of houses in the U.S. are wired with 6-position
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house—between the house's outside junction box and the interior
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202:, and the network of wires going to an exchange is known as the
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network, and usually also implies a single telephone number for
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Cross section of telephone cable of 1,800 twisted pairs, 1922.
170:. Often the customer end of that wire pair is connected to a
393:"Testing, Repairing & Installing Home Telephone Wiring"
27:
Single-user circuit on a telephone communication system
245:—4 pairs of 24 AWG (0.205 mm) solid copper.
449:"Telephone cable: overview and dielectric challenges"
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of open wire, separated by about 25 cm (10″) on
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Fixed telephone lines per 100 inhabitants, 1997–2007.
418:(1st ed.). Blue Ridge Summit, PA: TAB Books.
316:A Broadcast Engineering Tutorial for Non-Engineers
241:—the most common telephone cable in new houses is
44:with electric lines (top) and telephone cables.
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123:began to use two-wire circuits, called the
30:For the Electric Light Orchestra song, see
313:Pizzi, Skip; Jones, Graham (2014-04-24).
278:. U.S. Government Printing Office. 1910.
142:has also been used, and were carried in
391:Public Service Commission of Wisconsin.
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340:Staff, Cia Training Ltd (2003-04-01).
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103:Telephone lines are used to deliver
453:IEEE Electrical Insulation Magazine
100:purposes reserved for that user.
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557:Telecommunications infrastructure
524:
497:Doing Business with Saudi Arabia
368:"Get phone number from Facebook"
346:. CIA Training Ltd. p. 35.
127:, from each user's telephone to
150:above the ground, and later as
80:industrywide) is a single-user
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552:Telecommunications equipment
447:Wilkens, W.D. (March 1990).
415:Telephone repair illustrated
412:Bigelow, Stephen J. (1993).
374:(in Vietnamese). 2019-04-28
134:These wires were typically
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225:, thus making those jacks
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319:. CRC Press. p. 18.
494:Shoult, Anthony (2006).
172:data access arrangement
500:. GMB Publishing Ltd.
156:a device that converts
121:Bell Telephone Company
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193:. There is a central
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32:Telephone Line (song)
533:at Wikimedia Commons
290:"Telephone Circuits"
115:In the United States
181:In most cases, two
398:2018-03-28 at the
254:25-pair color code
223:telephone exchange
191:telephone exchange
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529:Media related to
507:978-1-905050-67-3
353:978-1-86005-123-4
326:978-1-317-90683-4
70:telephone circuit
16:(Redirected from
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275:Telephones
260:References
239:wall jacks
215:conductors
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