This Counter64 field reports the frames transmitted per second on the reverse direction of this bidirectional CES tunnel, as computed for this PM instance. Because this row is a completed prior day's 24-hour bin kept in the daily-history table, letting you compare one calendar day against another after the fact, and this specific field is an instantaneous computed rate of transmitted egress traffic rather than a running total, so a spike here shows up the moment it happens rather than only after the interval ends, it is the field to check when you need to see the reverse-direction egress throughput of the tunnel right now rather than a cumulative volume. For example, this counter might read 6,380 frames/sec during yesterday's completed 24-hour bin — if that number spikes on the reverse side while the opposite direction stays flat, it flags an asymmetric load or fault specific to that leg of the tunnel.