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
Posts
