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A party line (multiparty line, shared service line, party wire) is a local loop telephone circuit that is shared by multiple telephone service subscribers. [1] [2] [3]Party line systems were widely used to provide telephone service, starting with the first commercial switchboards in 1878. [4]
A modern line card has no two-to-four wire conversion whatsoever; it is strictly an analog/digital interface to a system that has a completely digital and integrated signal path internally. Using actual wires to circuit switch a telephone call became obsolete when the crossbar switch (a mechanical system) was replaced by 4ESS electronic ...
The Merlin system was originally sold in two-line, six-telephone (206); four-line, 10-telephone (410); and eight-line, 20-telephone (820) configurations. Later, there was a further 10-line, 30-telephone configuration, and with the addition of an expansion key service unit (KSU) the system could accommodate up to 30 lines and 70 telephones ...
Telephones built with this handset mounting were released in limited supply in 1927, and were known as the A1 telephone, the most common type for local and common battery service. The A2 handset mounting was made for special measured two-party line service and the A3 was for private telephone and residence systems. [23]
A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...
Plain old telephone service (POTS), or publicly offered telephone service, [1] is a retronym for voice-grade telephone service that employs analog signal transmission over copper loops. The term POTS originally stood for post office telephone service , [ citation needed ] as early telephone lines in many regions were operated directly by local ...
Differences between VoIP and other business phone systems. The public switched telephone network, or plain old telephone service, uses copper lines. Most telecommunications carriers no longer ...
Telephone hybrids intended for studio applications are usually rack-mount units [3] [4] [2] that have RJ-style connectors for the telephone line and either balanced analog or AES3 audio inputs/outputs on XLR connectors for the studio equipment connection. One, two, or more hybrids might be packaged within a unit.
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