Why RxMER?

RxMER per subcarrier analysis is a useful tool for monitoring and analyzing the performance of DOCSIS 3.1 OFDM channels in a cable network. RxMER stands for “Received Modulation Error Ratio,” which is a measure of the quality of the signal received by a subscriber’s modem. By analyzing the RxMER data on a per subcarrier basis, it is possible to determine how close the modem is to the threshold of each modulation scheme, such as 4096-QAM.

If the RxMER data shows that the modem is close to the threshold of a given modulation scheme, it could indicate that the subscriber may experience intermittent issues during changing weather conditions. For example, if the RxMER is right at the threshold or just 1 dB away from the threshold of 4096-QAM, it suggests that the modem is operating at the edge of its capability, and any changes in the signal quality could cause the modem to drop below the threshold and result in issues for the subscriber.

In such cases, a technician could use the RxMER data to troubleshoot the issue and identify the root cause of the problem. They may need to adjust the modem’s power level, check for signal interference, or upgrade the network equipment to improve the signal quality and ensure that the modem is operating within acceptable limits.

In summary, RxMER per subcarrier analysis is an important tool for technicians to diagnose and troubleshoot issues related to DOCSIS 3.1 OFDM channels in a cable network. It can help them identify potential problems before they impact subscribers and take proactive measures to prevent service disruptions.