This field reports the number of out of range packets transmitted on the interface, exposed here as cienaCesPmExtendedTxRxAllTimeBinTxLOutRangePkts. On this Ciena CES port's PM data, this fires when a frame's length field held a value outside the legal range for the encoding in use before it was transmitted out this port, again pointing at a locally-malformed frame rather than a wire issue; 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 healthy port would sit at 0 for out-of-range-length frames in this bin; even 23 is enough to warrant a look, since this class of counter isn't supposed to move under normal operation.