A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communication system. 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. These wires were typically copper, although aluminium has also been used, and were carried in balanced pairs separated by about 25 cm (10") on poles above the ground, and later as twisted pair cables. 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. 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. 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. 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. Those wires may be connected back to two telephone lines at the local telephone exchange, thus making those jacks RJ14 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 RJ11. telephone line 2 line corded telephone 2 line corded telephones 2 line cordless telephone 2 line cordless telephones 2 line phone 2 line phones 2 line telephone 2 line telephone answering machine 2 line telephone reviews 2 line telephone splitter 2 line telephone switch 2 line telephone system 2 line telephone systems 2 line telephones 2 line telephones cordless 2 lines phone 2nd phone line 2nd telephone line 3 line telephone 3 line telephone system 3 line telephone systems 3 line telephones 4 line cordless telephone 4 line telephone 4 line telephone system 4 line telephone systems 4 line telephones 6 line telephone 8 line telephone a new phone a new world record elo a phone system a telephone system about telephone about telephone communication about telephones activate telephone line add a phone line additional phone line all about telephones all about the telephone all light electric analog phone line analog telephone line analogue telephone line answering the telephone at t telephones be phone line be telephone bell telephone broadband no telephone line broadband phone broadband without a telephone line broadband without telephone line bt landline phone bt landline telephone bt line bt lines bt phone bt phone line bt phone lines bt phone services bt tel no bt telephone bt telephone line bt telephone line check bt telephone line test bt telephone lines bt telephone services business phone line business phone lines business telephone business telephone line business telephone line providers business telephone line rental business telephone lines business telephone systems buy landline phones by a phone cable phone cable phone line cable telephone calling plan calling record chat line chat line numbers chat line numbers free cheap business telephone lines cheap calls cheap home phone cheap home phone service cheap landline cheap landline phones cheap landline telephones cheap landlines phones cheap phone calls cheap phone line cheap phone line rental cheap phone lines cheap phone service