This field reports the number of bytes received per second on this PM instance, exposed here as cienaCesPmExtendedTxRxTotalStatsBinRxBytesPerSec. On this Ciena CES port's PM data, this is a pre-computed rate gauge for the bin rather than a running total, letting you read this port's received-bandwidth directly without manually differencing two RxBytes polls and dividing by elapsed time yourself; and this is the running grand-total counter for the extended Tx/Rx PM group, tallied since the bin's own StartTime (in practice since the PM instance was created or last reset), so treat it as a lifetime tally rather than a per-interval number. For example, polling this field mid-bin and seeing 14,400,000 bytes/sec received tells you this port's live throughput right now, no extra math required.