Comparing the decoded signal to the original. Frequency multiplexing is not possible in pulse-code modulation because the receiver only detects whether or not a pulse has arrived. You will need to sample at a rate of 2W or 10 kHz. If you allow 2 ns between pulses then the 10 bit sample will take 20 ns to be transmitted. The rest of the 10-4s interval will be blank and available for other conversations.
Time multiplexing is illustrated below.
Simultaneous transmission using time multiplexing. In Summary The continued progress in achieving coherent electromagnetic radiation at higher and higher frequencies has, in large measure, been responsible for the information revolution. Lightwave communications systems can transmit more information than previously thought possible because they utilize electromagnetic carrier waves of much higher frequencies than those used in other systems. FM radio and television transmission involve the modulation of a coherent carrier wave of about 108 hertz. Optical communications systems operate at frequencies of 1014 hertz, providing almost unlimited bandwidth and the greatest information-carrying capacity yet.