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 cienaCesPmExtendedTxRxAllTimeBinJabbersPkts. 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 '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 jabber frames in this bin; even 28 is enough to warrant a look, since this class of counter isn't supposed to move under normal operation.