This field reports the number of packets received by this PM instance, exposed here as cienaCesPmExtendedTxRxAllTimeBinRxPkts. On this Ciena CES port's PM data, this is the total received frame count regardless of type, the denominator you pair with RxBytes to get this port's average received frame size, which is itself a useful health signal (a sudden drop toward 64 bytes often means something upstream started sending keepalives or small control packets instead of data); and this 'all-time' counter for the extended Tx/Rx PM group has no fixed rollover schedule of its own — it just keeps accumulating from whenever the PM instance was last cleared, so a single reading only tells you the running total, not a rate. For example, a moderately busy port showing 826,000 frames received for this bin would be a plausible, unremarkable reading.