This field reports the number of length check error packets transmitted on the interface, exposed here as cienaCesPmExtendedTxRxTotalStatsBinTxLCheckErrorPkts. On this Ciena CES port's PM data, this fires when the 802.3 length/type field didn't match the actual size of the frame before it left this port, i.e. a malformed frame was assembled internally rather than corrupted in transit; 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 length-check-error frames in this bin; even 45 is enough to warrant a look, since this class of counter isn't supposed to move under normal operation.