Station card circuit for electronic key telephone system

Details Station card circuit for electronic key telephone system Station card circuit for electronic key telephone system

H - Electricity

04

J

363/22, 379/33

H04J 3/02 (2006.01)

Patent

CA 1178723

ABSTRACT OF THE DISCLOSURE A station card circuit for the key service unit of an electronic key telephone system comprised of data tran- sceiver means operative to receive and transmit time-division multiplexed digital data streams; a plurality of active port means, each comprising an input terminal for receiving status signals from the passive port to which it is connected and common means for converting said status signals to multi- plexed, binary-coded data, and an output terminal for sending service signals to the passive port to which it is connected, each output terminal being connected through an associated crosspoint to the output of a common current generator; stored program digital computer means operative to receive and process a time-division multiplexed digital data stream from said data transceiver and said multiplexed, binary-coded data, and to generate (i) a series of control data which determine which crosspoint or crosspoints should be closed, (ii) a time-division multiplexed digital data stream for transmission by said data transceiver means to an associated station set to control internal circuit connections therein, and (iii) service data for controlling the generation of ser- vice signals by said common current generator; and cross point control means operative to receive said series of con- trol data and to effect crosspoint closings in a first com- munication path in accordance therewith.

435923

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