Explain what do the letters pcm and pam stand for

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PCM and PAM

A. What do the letters PCM and PAM stand for? Why is PCM transmission preferred over PAM transmission? Give at least two reasons in your answer.

b. A four wire analog transmission circuit requires amplifiers at specific intervals if the distance between terminals exceeds 10 miles. A PCM transmission system also requires a four wire circuit and amplifiers. Why is a four wire circuit required?

Reference no: EM13139285

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