This field reports the number of too big packets transmitted on the interface, exposed here as cienaCesPmExtendedTxRxTotalStatsBinTxGiantPkts. On this Ciena CES port's PM data, these are locally-generated outbound frames that exceeded this port's size limit ('too big'), which points at a misconfigured local MTU/jumbo setting or a malformed frame being assembled by this device itself, not by anything on the wire; 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, a healthy port would sit at 0 for oversized outbound frames in this bin; even 10 is enough to warrant a look, since this class of counter isn't supposed to move under normal operation.