Discuss the frame structure of time division multiple access (TDMA) system and its efficiency. A 24 telephone channels network, each band limited to 3.4 kHz, are to be time division multiplexed by...

Extracted text: Discuss the frame structure of time division multiple access (TDMA) system and its efficiency. A 24 telephone channels network, each band limited to 3.4 kHz, are to be time division multiplexed by using pulse code modulation (PCM). If the PCM uses quantizer with 128 quantization level. Assume the sampling frequency Fs=8kHz, calculate the required bandwidth.