Frequency division multiplex switching system

Claim 2

Frequency-division switching system for interconnecting terminal equipment in a telecommunication exchange through RF means using a closed common volume as a transmission medium electromagnetically shielded from the exterior, each terminal equipment comprising a tunable transmission and a tunable reception device with control means for tuning the respective frequencies of their respective transmission and reception devices, detecting means associated with the reception device of each terminal equipment, said detecting means responsive to one or more signaling frequencies received through an RF transmission equipment and means for controlling suitable switching operations in accordance with the received signaling frequencies, and sending means associated with each transmission device to transmit one or more signaling frequencies to the detecting means associated with another terminal equipment so as to control switching operations in the other terminal equipment.

Claim 3

A frequency-division switching system according to claim 1, wherein there is a common control unit for directing the operation of said terminal equipment, means for interconnecting a terminal equipment via RF transmission with an equipment individual to either transmitting or receiving predetermined signaling information, each said terminal equipment comprising means for controlling a predetermined switching operation to minimize the load on said control.

Claim 4

A frequency-division switching system according to claim 1, wherein there are sequencing means in each terminal equipment operated in sequence responsive to said controlling means for marking the various consequential steps of a call and to cause resulting switching operations.

Claim 5

A frequency-division switching system according to claim 3, wherein there are means for the transmission of signaling and speech and reception thereof and supervision means for indicating the condition of the equipment determined by elements directly responding to the condition of said sequencing means.

Claim 6

A frequency-division switching system according to claim 4, wherein said terminal equipment comprises a first group of elements controlled by the said sequential circuit to continuously indicate the condition of the terminal equipment, and scanning means for scanning said elements to determine the condition of said terminal equipment whereby to transmit condition information to the said command control unit.

Claim 7

A frequency-division switching system according to claim 4, wherein said terminal equipment involved in establishing the speech circuit comprises a third group of elements controlled by thE said sequential circuit, said thrid group of elements being connected to the involved terminal equipment reception device demodulator, to the signaling detector thereof and to the speech circuit, said connection permitting the transmission of signaling and speech signals to the said terminal equipment at suitable times corresponding to a predetermined condition of said sequential circuit.

Claim 8

A frequency-division switching system for interconnecting terminal equipment in a telecommunication exchange through RF means within an electromagnetically shielded switching chamber and employing the volume of said chamber as the transmission media for the RF waves generated by said RF means, said terminal equipment comprising a tunable transmission and a tunable reception device with control means for tuning the respective frequencies of their respective transmission and reception devices, a control circuit associated with each device for interfacing between said device and a subscriber set, said control circuit including means responsive to one or more signaling frequencies received through an RF transmission equipment and means for controlling suitable switching operations in accordance with the received signaling frequencies, sending means associated with each transmission device to transmit one or more signaling frequencies to the detecting means associated with another terminal equipment so as to control switching operations in the other terminal equipment, means for sensing the condition of said subscriber set, and means for indicating said conditions in binary form, means for scanning said indicating means for said binary indications, and means for transmitting said binary indications for signaling control purposes.

Claim 9

A frequency-division switching system for interconnecting terminal equipment in a telecommunication exchange through RF means within an electromagnetically shielded switching chamber and employing the volume of said chamber as the transmission media for the RF waves generated by said RF means, said terminal equipment comprising a tunable transmission and a tunable reception device with control means for tuning the respective frequencies of their respective transmission and reception devices, a control circuit associated with each device for interfacing between said device and a subscriber set, said control circuit including means responsive to one or more signaling frequencies received through an RF transmission equipment and means for controlling suitable switching operations in accordance with the received signaling frequencies, sending means associated with each transmission device to transmit one or more signaling frequencies to the detecting means associated with another terminal equipment so as to control switching operations in the other terminal equipment, means for sensing the condition of said subscriber set, and means for indicating said conditions in binary form, means for scanning said indicating means for said binary indications, and means for transmitting said binary indications for signaling control purposes.