(5 points) A voice channel occupies a bandwidth of 4 KHz. We need to multiplex 10 voice channels with guard bands of 500Hz using FDM. Calculate the required bandwidth.

(6 points) In block coding, if k =6 and n =9, what is the number of invalid codewords?

(8 points) We need to synchronize TDM and combine 10 digital sources, each of 150 Kbps. Each output slot carries 1 bit from each digital source, but one extra bit is added to each frame for synchronization.

a)What is the size of an output frame in bits?

b)What is the output frame rate?

c)What is the output data rate?

(8 points) We have 8 sources, each creating 200 8-bit characters per second. We use Statistical TDM to combine those sources. The interleaved unit is one character. Each frame carries 5 slots at a time, and 3-bit addresses are added to each slot.

What is the size of an output frame in bits?

What is the output frame rate?

What is the output data rate?

(7 points) A sender needs to send out 4 numbers (3, 6, 12, 7). Answer the following:

Find the checksum at the sender site. The checksum is represented in 4 bits.

Find the checksum at the receiver site if there is no error