This read-only Counter is the running total of all frames transmitted by this port since the last counter reset, the outbound counterpart to ciscoTsPortStatsInFrames. Comparing this against InFrames for the same port gives a rough sense of traffic directionality, a port serving mostly as a source of traffic, like a busy server uplink, would show OutFrames well above InFrames, and vice versa for a port serving mainly as a sink. A large and growing gap between the two, in either direction, is useful context when sizing that port's link for future capacity.