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Φ(x, t) = F(x − ct) + G(x + ct)

where F(x-ct) is the forward travelling wave and

G(x+ct) is the reverse travelling wave

'x' is the distance from the origin. Now my question is where does the origin lie? Usually in Transmission lines we assume that origin lies in the load (right side) but if we see this equation it looks as if the origin lies in the source (generator) side in accordance with the wave equation.

Thanks in advance.