c$.$ What is Multiplexing? and Write a short note on Wavelength Division Multiplexing WDM

$3$ Mks

$5.$

a$.$

i$.$ What is the definition of a linear block code?

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ii$.$ In a block code, a dataword is $20$ bits and the corresponding codeword is $25$ bits. What are the values of $k,r,$ and $n$ according to our definitions in the class? How many redundant bits are added to each dataword?

$2$ Mks

iii. In a codeword, we add two redundant bits to each $8-$bit data word. Find the number of VALID CODEWORDS and INVALID CODEWORDS

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b$.$

i$.$ Given the dataword $1001111$ and the divisor $1011,$ show the generation of the CRC codeword at the sender site using binary division.

$2$ Mks

$2$ Mks

ii$.$ For the question QSa $($i$),$ show the CRC architecture

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c$.$ What is CHECKSUM and referring to fig Q$5$C$,$ explain the basic working mechanism that leaas $4$ Mks detection and correction of error in checksum

Fig: Q$5$C