Homework 4: Due Feb 20

1. Suppose a file of 10,000 characters is to be sent over a line at 2400 bps.

a. calculate the overhead in bits and time in using asynchronous communication. Assume 1 start and stop bit, and 8 bits to send the character itself for each character.

b. calculate the overhead in bits and time using synchronous communication. Assume that the data are sent in frames. Each frame consists of 1000 characters=8000 bits, and an overhead of 48 bits per frame.

c. what would the answers to parts a and b be for a file of 100,000 characters?

d. what would the answers to parts a and b be for the original file of 10,000 characters except at a data rate of 9600bps?

2. Minicase 4-1 from the Keen book

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