A DSL filter serves as what type of filter?

• A. Filters out the low frequency signal and passes high frequency
• B. Filters out the high-frequency DSL signal and passes low-frequency voice
• C. Amplifies the DSL signal
• D. Blocks all signals

Answer: (B)

On a copper line, voice and data occupy different frequency ranges. Voice is low-frequency, while DSL data uses higher frequencies. A DSL filter is designed to separate these by frequency: it passes the low-frequency voice to the telephone and blocks or attenuates the high-frequency DSL signal from the voice path. This keeps voice calls clear and prevents DSL interference on the phone line. You typically see a filter at each outlet to route voice and data properly. The other options don’t fit because they describe amplification, blocking everything, or removing the wrong part of the spectrum, none of which match how a DSL filter is meant to behave.