Phone pole with phone and mainly electric lines

A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communications system. For other uses of this term see Industry (disambiguation An industry (from Latin industrius, "diligent industrious" A telecommunication circuit is defined as follows The complete path between two terminals over which one-way or two-way communications may be provided Basic principle A traditional landline telephone system also known as "plain old telephone service" (POTS, commonly handles both signaling and audio information Typically this refers to the physical wire or other signaling medium connecting the user's telephone apparatus to the telecommunications network, and usually also implies a single telephone number for billing purposes reserved for that user. A wire is a single usually cylindrical, elongated string of drawn Metal. A telephone number or phone number is a sequence of numbers used to call from one Telephone line to another in a Telephone network.

In 1876 the earliest lines were single electrically conducting metal wires directly connecting one telephone to another with the Earth forming the return circuit. Year 1876 ( MDCCCLXXVI) was a Leap year starting on Saturday (link will display the full calendar of the Gregorian Calendar (or a Leap year In Electrical engineering, the term ground or earth has several meanings depending on the specific application areas Single wire earth return (SWER or single wire ground return is a Single-wire transmission line for supplying single-phase electrical power Later in 1878 the Bell Telephone Company began to use two-wire circuits (called the local loop) from each user's telephone to end offices which performed any necessary electrical switching to allow voice signals to be transmitted to more distant telephones. Year 1878 ( MDCCCLXXVIII) was a Common year starting on Tuesday (link will display the full calendar of the Gregorian calendar (or a Common The Bell System which was named for Alexander Graham Bell, the technologist popularly credited with the invention of the Telephone, was a Trademark and In Telephony, the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the Demarcation point of the In the field of Telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls

These wires were typically copper, although aluminium has also been used, and were carried in balanced pairs separated by about 25cm (10") on poles above the ground, and later as twisted pair cables. Copper (ˈkɒpɚ is a Chemical element with the symbol Cu (cuprum and Atomic number 29 WikipediaNaming A utility pole, telegraph pole, telephone pole, power (electricity pole, or telegraph post is a Pole used to support overhead Twisted pair Cabling is a form of wiring in which two conductors (two halves of a single circuit) are wound together for the purposes of canceling out Modern lines may run underground, and may carry analog or digital signals to the exchange, or may have a device that converts the analog signal to digital for transmission on a carrier system. Subscriber Loop Carrier refers to equipment providing central office-like Telephone interface functionality An analog or analogue signal is any continuous signal for which the time varying feature (variable of the signal is a representation of some other In Telecommunications transmission is the process of sending propagating and receiving an analogue or digital information signal over a physical point-to-point or In Telecommunication, a carrier system (loosely a synonym with carrier) is a Multichannel telecommunications System in which a number of individual

In most cases, two copper wires (tip and ring) for each telephone line run from a home or other small building to a local telephone exchange. "Tip" and "Ring" are common terms in the telephone service industry referring to the two wires or sides of an ordinary Telephone line. In the field of Telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls There is a central junction box 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 local loop, and the network of wires going to an exchange, the access network. In Telephony, the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the Demarcation point of the An access network is that part of a communications network which connects subscribers to their immediate Service provider.

Most houses in the U. S. are wired with 6-position modular jacks with four conductors wired to the house's junction box with copper wires. Modular connector is the name given to a family of Electrical connectors examples of which are pictured In Science and engineering, a conductor is a material which contains movable Electric charges. Those wires may be connected back to two telephone lines at the local telephone exchange, thus making those jacks RJ14 jacks. In the field of Telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls RJ11 is a Physical interface often used for terminating Telephone wires 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 RJ11. RJ11 is a Physical interface often used for terminating Telephone wires

Wiring information / pinouts

For information on wiring for the various telephone connectors, refer to telephone plug. A telephone plug is a Plug which allows a Telephone to connect to the local telephone network

See also

• Landline
• Party line
• Submarine communications cable