Bi-directional communication over a one-way link
First Claim
Patent Images
1. A communication apparatus for secure monitoring and control, comprising:
- first and second inputs, coupled respectively to receive communication signals from first and second stations;
first and second outputs, coupled respectively to convey the received communication signals to the first and second stations;
a single one-way link, which is physically capable of carrying the communication signals in one direction and incapable of carrying signals in the other, opposite direction; and
a pair of switches, which are coupled to the one-way link and are configured to be toggled between at least a first configuration, in which the communication signals are conveyed from the first input via the single one-way link to the second output, and a second configuration, in which the communication signals are conveyed from the second input via the single one-way link to the first output,wherein the pair of switches comprises;
a first double-pole switch, which is coupled between the first and second inputs and a transmit side of the single one-way link and is configured to select the first input for connection to the transmit side of the single one-way link in the first configuration and to select the second input for connection to the transmit side of the single one-way link in the second configuration, anda second double-pole switch, which is coupled between the first and second outputs and a receive side of the single one-way link and is configured to select the second output for connection to the receive side of the single one-way link in the first configuration and to select the first output for connection to the receive side of the single one-way link in the second configuration.
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Abstract
Apparatus for communication includes a single one-way link, which is physically capable of carrying the communication signals in one direction and incapable of carrying the communication signals in the opposite direction. Ancillary circuitry is coupled so as to cause the single one-way link to convey both first communication signals from a first station to a second station and second communication signals from the second station to the first station.
177 Citations
21 Claims
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1. A communication apparatus for secure monitoring and control, comprising:
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first and second inputs, coupled respectively to receive communication signals from first and second stations; first and second outputs, coupled respectively to convey the received communication signals to the first and second stations; a single one-way link, which is physically capable of carrying the communication signals in one direction and incapable of carrying signals in the other, opposite direction; and a pair of switches, which are coupled to the one-way link and are configured to be toggled between at least a first configuration, in which the communication signals are conveyed from the first input via the single one-way link to the second output, and a second configuration, in which the communication signals are conveyed from the second input via the single one-way link to the first output, wherein the pair of switches comprises; a first double-pole switch, which is coupled between the first and second inputs and a transmit side of the single one-way link and is configured to select the first input for connection to the transmit side of the single one-way link in the first configuration and to select the second input for connection to the transmit side of the single one-way link in the second configuration, and a second double-pole switch, which is coupled between the first and second outputs and a receive side of the single one-way link and is configured to select the second output for connection to the receive side of the single one-way link in the first configuration and to select the first output for connection to the receive side of the single one-way link in the second configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for of communication for secure monitoring and control, comprising:
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providing a first double-pole switch having first and second poles coupled, respectively, to receive transmissions from first and second stations and the first double-pole switch coupled to a transmit side of a single one-way link, such that in a first configuration transmissions from the first station are coupled to a transmit side of the single one-way link and in a second configuration transmissions from the second station are coupled to a transmit side of the single one-way link; providing a second double-pole switch having first and second poles coupled, respectively, to convey transmissions to the first and second stations, and the second double-pole switch coupled to a receive side of the single one-way link, such that in the first configuration transmissions from the single one-way link are conveyed to the second station and in the second configuration transmissions from the single one-way link are conveyed to the first station; setting the first and second double-pole switches to the first configuration; transmitting first communication signals, from the first station to the second station, through the first and second double-pole switches and the single one-way link, while the first and second double-pole switches are in the first configuration; setting the first and second double-pole switches to the second configuration; and transmitting second communication signals, from the second station to the first station, via the single one-way link, which is physically capable of carrying the communication signals in one direction and incapable of carrying the communication signals in the opposite direction, while the first and second double-pole switches are in the second configuration. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A communication apparatus for secure monitoring and control, comprising:
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a single one-way link, which is physically capable of carrying the communication signals in one direction and incapable of carrying the communication signals in the opposite direction; and ancillary circuitry, which is coupled so as to cause the single one-way link to convey both first communication signals from a first station to a second station and second communication signals from the second station to the first station, wherein the ancillary circuitry comprises; a first double-pole switch, which is coupled between the first and second stations and a transmit side of the single one-way link and is configured to select the first station for connection to the transmit side of the single one-way link in a first configuration and to select the second station for connection to the transmit side of the single one-way link in a second configuration, and a second double-pole switch, which is coupled between the first and second stations and a receive side of the single one-way link and is configured to select the second station for connection to the receive side of the single one-way link in the first configuration and to select the first station for connection to the receive side of the single one-way link in the second configuration. - View Dependent Claims (20, 21)
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Specification