This field reports the total number of packets received that were longer than 1518 octets (excluding framing bits, but including FCS octets), and had either a bad Frame Check Sequence (FCS) with an integral number of octets (FCS Error) or a bad FCS with a non-integral number of octets (Alignment Error), exposed here as cienaCesPmExtendedTxRxStatsBinJabbersPkts. On this Ciena CES port's PM data, this counts frames that are both over 1518 octets AND carry a bad FCS or alignment error, the classic 'jabbering NIC' pattern where a malfunctioning device on the other end is continuously transmitting oversized garbage onto this port; and this sits in the currently active extended Tx/Rx interval bin — its sibling StartTime/ClearTime fields mark exactly which window is being counted, so a change here reflects activity happening in the live collection interval, not something already filed away in history. For example, a healthy port would sit at 0 for jabber frames in this bin; even 2 is enough to warrant a look, since this class of counter isn't supposed to move under normal operation.