Prob 3: Suppose that at a given time of the day, in a city with a population of 1 million, 1% of the people are on the phone. a. What is the total bit rate generated by all these people if each voice call is encoded using PCM? Note, the PCM generates a bit rate of 64 Kbps (aka voice grade on the telephone line) for a voice signal. b. What is the total bit rate if all of the telephones are replaced by H.261 videoconferencing terminals? Note, a high quality videoconferencing needs the bit rate of 1.5 Mbps