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Wholesale line rental (WLR) is a service in which a telecommunications operator takes control of all the connections made through a telephone line from the native operator and collects the subscription fee from the subscribers. [1] [2]
A leased line is a private telecommunications circuit between two or more locations provided according to a commercial contract. It is sometimes also known as a private circuit , and as a data line in the UK.
Or, if wired for two-line service (rare), a second ring wire is carried on pin 2 for line 2, with the outer pair, pins 1 and 6 carrying the second line. This arrangement was introduced for the same reason as the capacitor in BS 6313; to allow backwards compatibility with older GPO style type 3 wire phones that lacked an anti-tinkle circuit ...
The GPO (later BT) began to supply the public with a far greater range of stylish telephone instruments. With the advent of 'New Plan' sockets and changes in legislation, subscribers were now free to either rent their telephone or purchase one from any source (as long as it was an approved model).
In 2001, BT Group launched its Answer 1571 service as a free service, available at no extra cost to its existing telephone line customers. In 2007 a charge of £1 was introduced for any month in which two chargeable calls are not made on the line (this might apply, for instance, to people who have Carrier preselect with another telephone ...
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The first subscriber's phone (called the 'audio customer') would be connected as normal. The second subscriber (called the 'carrier customer') would have his phone calls modulated on to an RF carrier or Carrier wave on the same physical phone line at around 40 kHz – high enough not to be noticeable to the audio customer.
Early-1970s Telephone Exchange model TESLA Automatic system Early model 464G Western Electric key telephone set. A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX).