that the relative positions of the terminals 128 136 and 140 have been rotated for clarity between fig6 and 7 while pin and socket type connectors are illustrated in fig6 and 7 understand that other types of connectors such as board edge connectors could also be used to accomplish the same purpose of supporting the daughter circuit board 108 and electrically connecting the daughter circuit board to the backplane 100 within the transceiver chip 106 is one or preferably several transceiver circuits 150 as shown in fig8 the transceiver circuit 150 includes a receiver 152 coupled between the bus line 110 and the backplane connector 104 with the input terminal of the receiver connected to the second terminal 136 of the transceiver chip 106 and with the output terminal of the receiver connected to the first terminal 128 of the transceiver chip also coupled between the bus line 110 and the backplane connector 104 and in parallel with the receiver 152 is an open collector driver 154 with the input terminal of the driver connected to the first terminal 128 of the transceiver chip 106 and with the collector of the driver connected through a diode 156 to the second.