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 closed, already-completed measurement interval kept in the CES-PM history table — a fixed, immutable snapshot of one specific past window, 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 3,235 frames/sec during the most recently completed 15-minute 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.