Abstract: A quality processing system comprises an interface and a processing system. The interface is configured to receive a first quality message from a wireless end device in the first region wherein the first quality message indicates a first quality metric of the first region during the session, and receive a session quality message indicating a session quality metric for the session. The processing system is configured to process the first quality metric with the session quality metric to determine if the session problem occurred in the first region or the second region, generate an isolation message indicating in which of the first region or second region the problem occurred, and transfer the isolation message.

Abstract: A method is provided for measuring polarization dependent loss in an optical transmission system. In the method, a first optical signal is generated, and a polarization of the first optical signal is altered over time. The first optical signal is combined with a second optical signal from the optical transmission system to yield a combined optical signal, which is coherently detected to yield a radio frequency signal. A power of the radio frequency signal is measured. The measured power of the radio frequency signal is processed to generate an indication of the polarization dependent loss of the optical transmission system.

Abstract: A method is provided for generating fault information associated with a communication channel. In the method, a time-varying error value associated with the communication channel is received. If the error value exceeds a first threshold, a first time value associated with the error value exceeding the first threshold is stored. If the error value then falls and remains below the first threshold for a first minimum time period before the error value exceeds and remains above a second threshold that is higher than the first threshold for a second minimum time period, the first time value is deleted; otherwise, a second time value associated with the error value exceeding the second threshold is stored. The fault information comprises the first time value and the second time value.