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Appen dix B Im pedan ce Matching an d Termination Resistors
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
RxDA TxDA
RxDB TxDB