A p p e n dxi B | Im p e dea Mncatc h ing a n dT erm in at ion Re si sto rs |
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When an electrical signal travels through two different resistance junctions in a transmission line, the mismatch will sometimes cause signal reflection. Signal reflection causes signal distortion, which in turn will contribute communication errors. The solution to this problem is to establish the same impedance at the line ends as in the line itself by terminating them with resistors.
It is normally sufficient when the value of the termination resistor equals the characteristic impedance of the transmission line. The resistors should be added near the receiving side. For example,
A50/A51 | Remote site |
TxDA 
RxDA
TxDB 
RxDB
RxDATxDA
RxDB 
TxDB
~25~
