Avoiding collisions in a PLC network with ST7580

[wogr]

I work with a network in which several participants can transmit simultaneously. Each participant can hear the transmission of another. I want to avoid collisions as much as possible. My idea is to use the PL_RX_ON pin of the ST7580 for this purpose. The payload of my packets is always only a few bytes.
When exactly does this pin become active and for how long?
I would like to prevent packets from being sent when this pin becomes active.