Abstract: The present patent application discloses the compounds according to Formula I shown below, or pharmaceutically acceptable salts thereof, wherein JB, n, R1, R2, R3, R4, R5, m and X as defined herein.

Abstract: A local area network for a multiple access communication system includes a bidirectional communication bus for providing a bidirectional transmitting medium for data signals. The bus includes at least two segments for providing alternate paths for the data signals. A plurality of stations are connected to the bus. Each station includes transceiver means for transmitting data signals onto the bus and for receiving data signals from the bus. A plurality of controllable switch means are provided each being connected for selectively disabling at least one of the transmitting and receiving functions of a respective one of the transceiver means. The transceiver means include first and second groups of transceiver means. Each group is connected to a respective one of the two bus segments.