Compare the efficiency of transmitting 100 bytes of 7- bit ASCII data via: a. An
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Question
Compare the efficiency of transmitting 100 bytes of 7- bit ASCII data via: a. An asynchronous data link with each character requiring one start bit, two stop bits, and a parity bit, with b. An Ethernet II data link (less the preamble) as shown in figure 5-17 with each character having its own parity bit, where efficiency = data bits transmitted / total bits transmitted.
Compare the efficiency of transmitting 100 bytes of 7- bit ASCII data via: a. An asynchronous data link with each character requiring one start bit, two stop bits, and a parity bit, with b. An Ethernet II data link (less the preamble) as shown in figure 5-17 with each character having its own parity bit, where efficiency = data bits transmitted / total bits transmitted.Explanation / Answer
a)
The number of bits present in each ASCII character = 7
Number of bits required to start bits for each ASCII character = 1
Number of bits required to stop bits for each ASCII character = 2
Number of bits required to parity bits for each ASCII character = 1
Therefore, the total number of bits required to send a single character = 7 + 1 + 2 + 1 = 11
Efficiency = data bits transmitted / total bits transmitted = 7 / 11 = 63.636 %
This means that the 63.636 percent is available for the user and the remaining 36.364 percent is used by the transmission protocol.
b)
The number of bits present in each ASCII character = 7
Number of bits required to parity bits for each ASCII character = 1
Therefore, the total number of bits required to send a single character = 7 + 1 = 8
Efficiency = data bits transmitted / total bits transmitted = 7 / 8 = 87.5 %
This means that the 87.5 percent is available for the user and the remaining 12.5 percent is used by the transmission protocol.
The ethernet II data link is 23.864 percent more efficient than the asynchronous data link.
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