![]() ![]() The key parameter for the bus termination resistor is the so-called characteristic impedance of the electrical line. Terminating the ends of the communication channel using termination resistors (simulation of the electrical properties of the transmission medium) prevents reflections in a high-speed CAN network. Bus terminationÄue to finite signal propagation speed, the effects of transient phenomena (reflections) grow with increasing data rate and bus extension. Therefore, in practice twisted pair conductors are generally used as the physical transmission medium. Twisting of the two lines reduces the magnetic field considerably. ![]() ![]() Consequently, the transmission medium (CAN bus) consists of two lines: CAN high line (CANH) and CAN low line (CANL). This effectively eliminates the negative effects of interference voltages induced by motors, ignition systems and switch contacts. ![]() Physical signal transmission in a CAN network is based on transmission of differential voltages (differential signal transmission). ![]()
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