Digitally Encoded

Learning Goal: I’m working on a networking multi-part question and need an explanation and answer to help me learn.

Question 1 The following bit stream is to be digitally encoded: 1 0 1 1 0 1 0 1 0 1 1 1 Draw the waveforms if the bit stream were to be encoded using a) Unipolar b) NRZ c) Manchester d) Differential Manchester encoding: Here’s how this scheme works. A logic 0 is represented by a transition at the beginning AND at the middle of the clock interval. The transition can be from low to high or high to low, that is, if it was low, it goes to high and if it was high, it goes to low. Logic 1 is represented by a transition ONLY at the middle of the interval. Again, the transition can be either low to high or high to low. In all the above cases, assume that the signal is HIGH to begin with.

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Question 2 The following message is to be sent by a host running a protocol with starting and ending flags and bit stuffing. The starting and ending flags are both 01111110 and they have not yet been added. 0111111011111011110011111100111111000000111110101111110 What is the message actually sent (after bit stuffing and after adding the starting and ending flags)?

Question 3 If the generator polynomial is x5 + x3 + 1 and the message to be sent is 1110010111, what is the actual bit string transmitted? Show steps.

 

 

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