This counts 802.3x PAUSE frames this port has sent to its link partner. Every increment here is this specific interface telling the far end of the link to hold off for a moment, so a rising TxPausePkts count for the current, still-accumulating short interval bin means something downstream of this exact port -- typically a congested egress queue -- is falling behind and the switch is using flow control rather than simply dropping frames. For example, TxPausePkts climbing to 85 for this in-progress short-interval bin while RxBytesPerSec on the same port stays flat would show this interface actively throttling an upstream sender to protect its own queue.