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Telephone line
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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, and usually also implies a single telephone number for billing purposes reserved for that user.
Telephone lines are used to deliver landline telephone service and digital subscriber line (DSL) phone cable service to the premises.[3] Telephone overhead lines are connected to the public switched telephone network.[4][5] The voltage 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.
- ^ Telephones. U.S. Government Printing Office. 1910.
- ^ "Telephone Circuits". ScienceDirect. Retrieved 2022-12-12.
- ^ Pizzi, Skip; Jones, Graham (2014-04-24). A Broadcast Engineering Tutorial for Non-Engineers. CRC Press. p. 18. ISBN 978-1-317-90683-4.
- ^ Staff, Cia Training Ltd (2003-04-01). Ecdl/Icdl Syllabus 4 Module 1 Basic Concepts of IT: European Computer Driving Licence. CIA Training Ltd. p. 35. ISBN 978-1-86005-123-4.
- ^ "Get phone number from Facebook". lucidgen.com (in Vietnamese). 2019-04-28. Retrieved 2024-08-15.
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