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ust as a voice becomes harder to hear if its source moves away, so too, information is attenuated as it passes through cables as signals or through space as waveforms, or it is corrupted, affected by external noise.
To solve this problem, transmission equipment converts information into signals that can be easily transmitted so that it can be passed accurately over a long distance.
In addition, a trunk transmission line to transmit a large amount of information over a long distance, for example, must be a single transmission medium that can send a large amount of information to improve equipment efficiency. This is another important role of transmission equipment.
