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A special $PCM$ system uses $32$ channels of data, one whose purpose is an identification (ID) and synchronization. The sampling rate is $4$ kHz. The word length is $5$ bits. Find the serial data rate.

1. $1280\;kHz$
2. $160\;kHz$
3. $320 \;kHz$
4. $640 \;kHz$

Serial data rate = sampling rate x no. bits/frame = 4 kHz × 32×5 =   640 kHz.

option d