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Communication Networks

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Hi I'm stuck on 2 questions. I've looked through the examples in the text book, but cannot apply them to the questions. Any assistance on how to approach these questions would be appreciated.

1) Analog tv signal is low-pass signal with bandwidth of 4 MHz. What bit rate required if we quantize signal and require SNR of 60dB. (Don't understand quantize part)

2) Suppose header consists of four 16 bit words (11111111 11111111, 11111111 00000000, 11110000 11110000, 11000000, 11000000). Find internet checksum for code. (I know how to do this if it is using 4 bit words, but not 16)

Thanks

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