1. Indicate whether a conference-call connection is better or may be worse than a single-party call if a digital switch is used (at the CO) instead of an analog switch. Explain your answer.
2. Full-duplex data of 24 kbs in each direction from a personal computer is sent via a twisted-pair telephone line having a bandpass from 300-2700 Hz. Explain why modems are needed at each end of the line.