What could potentially prevent interference during a DSL and phone line connection?

Proper filtering of the lines is essential in preventing interference during a DSL and phone line connection. DSL (Digital Subscriber Line) technology operates over the same copper lines used for traditional phone service. Without proper filtering, the signals from the DSL and the phone can interfere with each other, leading to a degraded connection quality and slower speeds.

Filters, specifically DSL filters or splitters, are designed to separate the DSL signal from the voice signal on the phone line. This allows both services to function simultaneously without disruption. By effectively filtering the lines, the frequencies used by DSL can be preserved, reducing noise and maintaining a stable internet connection, while allowing clear voice calls on the same line.

The other options do not appropriately address the issue of interference. Using cheaper equipment typically compromises quality and reliability, which may introduce more interference. Only using a phone line would eliminate the DSL connection entirely, thereby not addressing interference concerns. Prioritizing speed over quality could lead to decisions that worsen the connection quality rather than optimize it for both DSL and voice services. Hence, proper filtering is crucial for maintaining clarity in communication while ensuring optimal DSL performance.