This counter counts how many times the system has activated Selective Cell Discard (SCD) on the medium-priority buffer, where it proactively drops lower-grade cells to prevent full buffer overflow. Network operators use this to understand how often the switch is managing congestion through cell discard rather than complete overflow, which protects more critical traffic. A count of 150 indicates the system has discarded cells 150 times on the medium buffer to prevent complete overflow.