Why are high-pass filters (HPF) considered a short-term solution at tap points for drops?

High-pass filters (HPF) are viewed as a short-term solution at tap points for drops primarily because they must be removed once two-way services are activated. HPFs are typically employed to block low-frequency signals, which can be beneficial in situations where only one-way service is available. However, when transitioning to two-way services, the network requires the full frequency spectrum for both upstream and downstream communication. Therefore, keeping the HPF in place would impede the effective function of two-way services which rely on low-frequency signals.

In addition, while HPFs are designed to improve signal quality by filtering out unwanted low-frequency noise, their ongoing use after introducing two-way capabilities can lead to disruptions in service quality. Proper network management necessitates the timely removal of such filters to ensure an optimal frequency response that accommodates all required services effectively.