Patent ID: 6038211
Filing Date: 2000-03-14
Classification: H04J

Abstract:
A terminal for a bidirectional synchronous digital hierarchy link with automatic protection switching conveying multiplexed data, said terminal being connected to a second like terminal by first and second transmission lines for respectively sending to said second terminal and receiving from said second terminal, said terminal including:two send devices each receiving n first and n second SDH multiplexes, where n is greater than or equal to 1, each of said SDH multiplexes respectively conveying n first and n second far end remote failure signals, each send device including:means for extracting from each of said n first and n second SDH multiplexes the n first and n second far end remote failure signals, respectively,means for supplying a multiplex to be sent over said first line by multiplexing the n first and n second multiplexes received by said send device and service data specific to said link with automatic protection switching, and inserting into said data n third and n fourth far end remote failure signals, the latter 2n signals being extracted by the other send device,an automatic protection switch for transmitting to said first line one of the two multiplexes respectively supplied by said two send devices,two receive devices each having:an input connected to said second line to receive the same multiplex transmitted by said second line, said received multiplex conveying n third and n fourth SDH multiplexes respectively including n fifth and n sixth far end remote failure signals and service data specific to said link with automatic protection switching, said data including n seventh and n eighth far end remote failure signals;means for extracting from the received multiplex said n third and n fourth SDH multiplexes and for extracting said n fifth, n sixth, n seventh and n eighth far end remote failure signals, anda logic device for receiving the 4n far end remote failure signals supplied by each of said two receive devices and deducing therefrom an automatic protection switch control signal.