Abstract: In a method of reducing and diagnosing upstream ingress noise in cable data system utilize a MAC/MAP management messages via a downstream path based on Cable Systems Interface Specification (DOCSIS) to provide precise control of gates deployed near the user side provide a powerful algorithm for CATV operators to mitigate ingress noise problem.

Abstract: In a method of reducing upstream ingress noise in cable data system, downstream management messages containing information about user group data uploading time and channel frequency are broadcasted by a headend of the cable data system. The broadcasted downstream management messages are monitored, so as to determine an upstream channel connection time schedule for the user groups. Each user group is connected to an upstream channel of the headend only at a data uploading time scheduled for that user group. As a result, ingress noise existed in the user group will be uploaded to the headend only when the user group is connected to the headend. Therefore, accumulation of upstream ingress noise at the headend is effectively reduced, and the headend network can maintain good signal quality to ensure best network connection.