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signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user. The term is...

in 1964, the Commonwealth Pacific Cable System (COMPAC), with 80 telephone channel capacity, opened for traffic from Sydney to Vancouver, and in 1967...

The public switched telephone network (PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony...

A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN) or large...

cable telephone service. The downstream channels occupy a band of frequencies from approximately 50 MHz to 1 GHz, while the upstream channels occupy...

wideband voice on the same channel, with improved quality of a wider analog voice channel. The earliest end-to-end analog telephone networks to be modified...

used microwave relays to multiplex eight telephone channels over long distances. A link across the English Channel allowed General Bernard Montgomery to...

known as the National Telephone Numbering Plan, which is the system for assigning telephone numbers to subscriber stations. Telephone numbers are of variable...

with the development of telephone carrier multiplexing in 1910. The multiplexed signal is transmitted over a communication channel such as a cable. The multiplexing...

signalling channel from the end node to the network. ISDN is one such service that uses a separate signalling channel while plain old telephone service (POTS)...

international telephone communications in Abkhazia, retaining only 16 outgoing and 24 incoming telephone channels of the 151 incoming and 182 outgoing channels that...

ultimately the number of RF channels limits the number of calls that a cell site could handle. FDMA is a familiar technology to telephone companies, which used...

multi-frequency tones transmitted on the telephone line audio channels, also known as bearer channels. Since the bearer channels are directly accessible by users...

A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony...

It was inaugurated on September 25, 1956, initially carrying 36 telephone channels. In the first 24 hours of public service, there were 588 London–U...

communication channel, it is progressively degraded due to loss of power. For example, when a telephone call passes through a wire telephone line, some of...

many television channels are carried simultaneously on a single cable. FDM is also used by telephone systems to transmit multiple telephone calls through...

sub-channel 1, etc. The plesiochronous digital hierarchy (PDH) system, also known as the PCM system, for digital transmission of several telephone calls...

very expensive. PCM's initial goal was to convert an analog voice telephone channel into a digital one based on the sampling theorem. PCM30 describes...

digital telephone lines, into one channel of higher bandwidth or higher digital bit rate, such as a DS-1 (T1) circuit, so that all the channels can be...