Multiple choice A traditional telephone line has a bandwidth of _________. 2000Hz 2000MHz 4000Hz 4000MHz Reveal answer Fill a bubble to check yourself C Correct answer Explanation Traditional telephone lines (POTS) use a 4 kHz voice-grade channel. The standard range is approximately 300 Hz to 3.4 kHz, requiring about 4 kHz of bandwidth to transmit voice signals with adequate quality.