This is the most-significant 32 bits of the same 64-bit dropped-frame counter split across two objects, incrementing only when the LSB half, gnEthStatisticDroppedPacketsLsb, rolls over past its own 32-bit range. It matters specifically on very high-throughput or long-uptime links where the LSB alone would wrap around, exceed 4 billion, between polling intervals, silently resetting to a small number and making the drop count look like it went down when it actually kept climbing. A monitoring system polling this radio needs to track increments in this MSB object to correctly detect and account for LSB wraparound in its combined 64-bit drop total.