What is the maximum in-channel frequency response defined in DOCSIS?

The maximum in-channel frequency response defined in DOCSIS (Data Over Cable Service Interface Specification) is specified as 3.0 dB peak-to-valley. This measurement indicates the acceptable variation in signal level over the specified frequency range of the channel. A 3.0 dB peak-to-valley response signifies that the signal should not vary more than that amount from its average level throughout the channel's operating frequency range, ensuring a consistent and reliable signal quality. This specification is crucial for maintaining the integrity of data transmission over cable networks, as it helps to minimize issues related to distortion and ensures that the signal remains within a tolerable range for effective communication.