Method of transmitting control signals and pbx system

Details Method of transmitting control signals and pbx system Method of transmitting control signals and pbx system

H - Electricity

04

Q

H04Q 3/42 (2006.01) H04Q 3/62 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2153729

A large amount of control information is transmitted at high speed to a telephone terminal without changing the transfer capacity of a current control channel. When a call is terminated by any of the extension terminals, the extension terminal sends, for example, a lamp control signal to a extension terminal via D channel thereafter, if a large amount of display control signals are to be transmitted to the extension terminal, after sending the display control signal to the extension line, a central controller causes the extension line to send a B channel seizing signal to the extension terminal via D channel. This causes paths of the B channel(s) to be so changed that both the controllers within the extension line and the extension terminal are accessible to the B channel(s). Subsequently, the extension line can transmit the display control signals at high speed to the extension terminal via B channel(s). Thus, the extension terminal displays on the display device the display control signals received through the B channel(s).

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