HOT-LINK TELEPHONE EXCHANGE Russian patent published in 2002 - IPC

FIELD: electric communications; hot-link communications between subscribers of stationary networks and those of mobile communication centers. SUBSTANCE: telephone exchange designed for operation both using voice frequency channels and digital channels incorporating provision of encrypting data transmitted over channels has line input unit 1, subscriber line equipment unit 3, control device 6, workstation unit 7, channel equipment unit 9, transit connections unit 10, connecting lines equipment 11, channel input unit 15, transfer lines equipment unit 22, subscriber lines 23, connecting lines 24, voice frequency channel 25, digital channels 26, and transfer lines 27. Newly introduced in telephone exchange are subscriber's distribution frame unit 2, servicing instruments unit 5, data display unit 8, unit of automatic speech- converting devices 13, interface unit 14, differential systems unit 12, voice-frequency signal conversion unit 20, channel switching unit 16, group data encryption unit 17, digital channel switching unit 18, interaction signal unit 19, individual data encryption unit 21, and new ties are used between known units. EFFECT: enhanced capacity due to reduced busy time of exchange devices. 1 dwg