Why are high-pass filters (HPF) considered a short-term solution on drops without two-way services?

High-pass filters (HPF) are utilized in various communication systems primarily to eliminate unwanted low-frequency noise and allow high-frequency signals to pass through. The reason they are considered a short-term solution on drops without two-way services is that they are not typically designed to operate in conjunction with two-way communication systems.

When two-way services are activated, the signal requirements change, and the presence of a high-pass filter may impede the transmission of lower frequency return signals that are necessary for upstream communication. Consequently, these filters must be removed to allow the network to function effectively in a two-way service environment. This means that their use is only appropriate until such time as full two-way communication capabilities are established, hence categorizing them as a temporary solution.

In contrast, while high-pass filters do reduce the signal strength and may not handle high power inputs well, these aspects do not specifically define their role as a short-term solution in the context of transitioning to two-way services.