Question

A system transmits a block of information containing ten packets each with eight data bits, a start bit, and a stop bit. Additional 'overhead' bits include a 4-bit synchronization code at the beginning of the block and a parity bit at the end of the block. What is the transmission efficiency?

• A. 75.6%
• B. 80.5%
• C. 78.8%
• D. 76.2%

Hint:

Transmission efficiency is the ratio of useful data bits to the total transmitted bits, expressed as a percentage.

Answer 1

The Correct Option is C

To calculate transmission efficiency: 1. Data bits in each packet: 8 bits. 2. Overhead bits per packet: 1 start bit + 1 stop bit = 2 bits. 3. Total bits per packet: 8 + 2 = 10 bits. 4. Total bits for 10 packets: 10 × 10 = 100 bits. 5. Additional overhead bits: 4 synchronization bits + 1 parity bit = 5 bits. 6. Total transmitted bits: 100 + 5 = 105 bits. 7. Transmission efficiency: Efficiency = (Useful data bits / Total transmitted bits) × 100 = (80/105) × 100 = 78.8%.