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Suppose that the following character coding is used in a data link protocol:ABFLAGESCAssume a frame to be sent over a transmission link contains the following payload:ABESCFLAGShow the bit sequence of the payload transmitted over the link,i. If the frarning protocol uses bye stuffing.ii. If the framing protocol uses bit stuffing.Suppose both the starting and ending delimiter of a frame is 01 1 I I 1 1 0.

Question

Suppose that the following character coding is used in a data link protocol:ABFLAGESCAssume a frame to be sent over a transmission link contains the following payload:ABESCFLAGShow the bit sequence of the payload transmitted over the link,i. If the frarning protocol uses bye stuffing.ii. If the framing protocol uses bit stuffing.Suppose both the starting and ending delimiter of a frame is 01 1 I I 1 1 0.

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Solution

i. If the framing protocol uses byte stuffing:

  1. Start with the payload: ABESCFLAG
  2. Add the starting delimiter: 01 1 I I 1 1 0
  3. Replace any occurrence of the delimiter in the payload with an escape character (E): ABESCEFLAG
  4. Add the ending delimiter: 01 1 I I 1 1 0
  5. The bit sequence of the payload transmitted over the link is: 01 1 I I 1 1 0 ABESCEFLAG 01 1 I I 1 1 0

ii. If the framing protocol uses bit stuffing:

  1. Start with the payload: ABESCFLAG
  2. Add the starting delimiter: 01 1 I I 1 1 0
  3. Replace any occurrence of the delimiter in the payload with the delimiter followed by an extra 0: ABESC0FLAG
  4. Add the ending delimiter: 01 1 I I 1 1 0
  5. The bit sequence of the payload transmitted over the link is: 01 1 I I 1 1 0 ABESC0FLAG 01 1 I I 1 1 0

This problem has been solved

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