a system and method of transmitting and receiving bit serial information is disclosed . in a differential embodiment , serial bits are transmitted by a pair of line - matched differential drivers that are ac coupled to a two - conductor transmission line . a receiver is ac coupled to the line and receives the transmitted serial information via a high pass filter . the receiver includes a level - triggered latch that provides a threshold for receiving the serial information , changes state to reflect the received information , and then clamps the received information to the state of the latch . in a single - ended embodiment , the ac - coupled receiver receives the bit serial information via a high pass filter . the resistance for the filter is an active device that also provides a voltage threshold for the receiver . the received bit serial information changes the state of a device which then alters the threshold , via hysteresis , for the net bit of serial information .