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 cienaCesPmExtendedTxRxHist24HBinTx2048To4095OctsPkts. 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 lives in one of the rotating 24-hour daily history bins for the port's extended Tx/Rx PM group, so it captures a full day's worth of activity that you can compare day-over-day against the other retained daily bins. For example, a moderately busy port showing 5,840,000 2048-4095-byte frames for this bin would be a plausible, unremarkable reading.