This field reports the total number of packets (including bad packets) transmitted that were between 2048 and 4095 octets in length inclusive (excluding framing bits but including FCS octets), exposed here as cienaCesPmExtendedTxRxStatsBinTx2048To4095OctsPkts. On this Ciena CES port's PM data, this bucket counts frames in the 2048-4095 octet range, well above standard Ethernet size, so it only moves when genuinely large jumbo frames — typical of storage replication or bulk backup traffic — are crossing this specific 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 moderately busy port showing 80 2048-4095-byte frames for this bin would be a plausible, unremarkable reading.