Which of the following is essential for detecting transmission errors in a communication system?

The BERT test, or Bit Error Rate Test, is essential for detecting transmission errors in a communication system because it quantitatively measures the number of bit errors in a given amount of data transmitted over a communication channel. By comparing the transmitted data to the received data, the BERT test can identify any discrepancies that indicate errors during transmission. This is crucial for ensuring data integrity and reliability in communication systems, especially in environments where data accuracy is paramount.

The BERT test is specifically designed for this purpose and provides a clear method for evaluating the quality of the transmission medium, making it a fundamental tool in assessing the performance of communication links. By conducting this test regularly, operators can monitor and improve the reliability of their communication systems.