Which of this is not a constituent of residential telephone line?
A. A high-speed downstream channel
B. A medium-speed downstream channel
C. A low-speed downstream channel
D. None of the mentioned
Answer:A
Which of this is not a constituent of residential telephone line?
A. A high-speed downstream channel B. A medium-speed downstream channel C. A low-speed downstream channel D. None of the mentioned
Explanation: The third part is ordinary two way telephone channel.