This is xmitPause on the historical pause-stats record, the archived count of PAUSE frames this specific port itself transmitted, captured in this sample. It documents that this port, not its peer, was the one signaling overload at that point in the past, useful for distinguishing historically which side of a link was struggling. For example, a spike in this field, rather than in recvPause, in a record from a known slow period identifies the local device on this port as the bottleneck, not the upstream fabric.