The T-1 telephone system multiplexes together 24 voice channels. Each voice channel is 4 kHz in bandwidth and is sampled every 1/8000 of a second, or every 125 µs. If the 24 channels are to share the system by time-division multiplexing,
(a) what is the minimum system bandwidth if the voice signal is sampled for PAM?
(b) what is the minimum system bandwidth if the voice signal is sampled for 8-bit binary PCM?