This counter object counts the number of seconds during a 15-minute measurement interval when the VDSL2 (Very-high-speed Digital Subscriber Line 2) transceiver experienced problematic line conditions such as CRC errors, loss-of-signal, signal error frame, or line protocol reset. It is used to detect periods of poor line quality or intermittent connectivity issues affecting broadband data service. Network technicians monitor this metric to diagnose xDSL line problems and to determine if service degradation warrants line conditioning or hardware replacement.