Device for the double-call operation of a telephone set connected to an exchange by radio channel

Claim 2

In a system for double-call communication telephone sets connected to exchange equipment by a radio channel in a subscriber system having supplementary sets connected to the exchange equipment, permitting double call and communication transfer from one telephone set to another, the system permitting each subscriber connected to the exchange by radio channel to have the same possibilities of operation as telephone sets connected to the exchange by metallic line, a device comprising two repeaters connected to respective radio channel equipment inserted one at each end of the radio beam in the link between the telephone set and the exchange equipment, the link between each repeater and its associated radio channel equipment being effected by four wires, two of which provide for the transmission in each direction of orders in direct current and the other two being reserved for the transmission of voice frequency signals.

Claim 3

Device according to claim 1 wherein the repeater connected to said telephone set includes a supply relay connected in a loop circuit with said telephone set to be actuated upon closing of said loop, a differential relay connected in said loop circuit to be actuated by a selective operation at said telephone set indicating a double-call operation, and double-call relay means responsive to operation of said differential relay for transmitting a first order to the repeater at the exchange end indicating initiation of an operation.

Claim 4

Device according to claim 2 wherein the repeater connected to said exchange equipment includes command preparation relay means for transmitting a second order to the repeater at the telephone set end indicating readiness to receive further control and an exchange reception relay responsive to said first order for actuating said command preparation relay means.

Claim 5

Device according to claim 3 wherein said command preparation relay means includes a first command preparation relay actuated by said reception relay, and a second command preparation relay responsive to actuation of said first command preparation relay to apply said second order for transmission to the repeater at said telephone set end.

Claim 6

Device according to claim 4 wherein said command preparation relay means further includes a nOrmally actuated delay relay deactuated in response to operation of said reception relay after a predetermined time delay, said second command preparation relay operable only prior to deactuation of said delay relay.

Claim 7

Device according to claim 3 wherein the repeater connected to said telephone equipment includes a telephone reception relay actuated by receipt of said second order from the repeater connected to said exchange equipment and an auxiliary relay actuated in response to operation of said telephone reception relay and said double call relay to deactuate said double call relay and thereby terminate transmission of said first order.

Claim 8

Device according to claim 6 wherein the repeater connected to said exchange equipment further includes double call relay control means responsive to termination of transmission of said first order deactuating said exchange reception relay and said first command preparation relay for applying a supervisory signal to the loop connected to said exchange equipment indicating double call.

Claim 9

Device according to claim 2 wherein the repeater connected to the telephone set further includes a telephone disengagement relay responsive to deactuation of said supply relay due to opening of said loop circuit for transmitting a first order to the repeater at the exchange end indicating initiation of an operation.

Claim 10

Device according to claim 8 wherein the repeater connected to said exchange equipment includes command preparation relay means for transmitting a second order to the repeater at the telephone set end indicating readiness to receive further control and an exchange reception relay responsive to said first order for actuating said command preparation relay means.

Claim 11

Device according to claim 9 wherein said command preparation relay means includes a first command preparation relay actuated by said reception relay, and a second command preparation relay responsive to actuation of said first command preparation relay to apply said second order for transmission to the repeater at said telephone set end.

Claim 12

Device according to claim 10 wherein said command preparation relay means further includes a normally actuated delay relay deactuated in response to operation of said reception relay after a predetermined time delay, said second command preparation relay operable only prior to deactuation of said delay relay.

Claim 13

Device according to claim 11 wherein the repeater connected to said exchange equipment further includes an exchange disengagement relay operated during operation of said first command preparation relay in response to deactuation of said delay relay to open the loop circuit including the exchange equipment and deactuate said first command preparation relay terminating the transmission of said second order.

Claim 14

Device according to claim 12 wherein the repeater connected to said telephone set includes auxiliary relay means responsive to termination of the transmission of said second order at the time said telephone disengagement is actuated to deactuate said telephone disengagement relay and thereby terminate transmission of said first order. 14 In a system for connecting a telephone station connected to exchange equipment by a radio channel in a telephone exchange equipment serving an individual organization and having connections to a public telephone exchange, a device for double communication and/or call transfer from one telephone station to another, said device comprising two repeaters connected one between a respective radio channel equipment and a telephone station, the other between a second radio equipment, and said telephone exchange equipment, each repeater comprising relay means responsive to orders given by said telephone station, the link between each repeater and its radio channel equipment comprising two wires for the transmission or orders and two wires for the transmission of voice signals.