Multiple choice

Which of the following transmission modes is used for data communication along telephone lines?

  1. Parallel

  2. Serial

  3. Synchronous

  4. Asynchronous

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Telephone lines use serial transmission mode where data is sent sequentially, one bit at a time, over a single channel. Parallel transmission requires multiple simultaneous paths, which standard telephone infrastructure doesn't support.