Patent ID: 9584521
Date: 2017-02-28
CPC Classifications: H04L,H04Q

Claim:
1. A communication apparatus for secure monitoring and control, comprising: first and second inputs; first and second outputs; a single one-way link, which is physically capable of carrying communication signals in one direction and incapable of carrying signals in the other, opposite direction; a first double-pole switch, coupled between the first and second inputs and a transmit side of the single one-way link, configured to allow passage of signals only from the first input to the transmit side of the single one-way link in a first configuration and to allow flow of signals only from the second input to the transmit side of the single one-way link in a second configuration; and a second double-pole switch, coupled between the first and second outputs and a receive side of the single one-way link, and is configured to allow passage of signals from the receive side of the single one-way link only to the second output in the first configuration and only to the first output in the second configuration.