How do the TOF sensors distinguish between their own bounce and another sensor's [optical] ping?

[edsut]

I saw somewhere in the forum that the TOF sensors see [optical] pings from other sensors as ambient light (meaning they are able to ignore them) but are still able to detect their own bounce.  Is that true?  If yes, can someone explain how that works?

Note, I'm referring to the situation where you have independent devices in an area moving around, each of which have their own TOF sensor(s) for obstacle avoidance.  The point here is that there is no synchronization between each device, so there would surely be overlapping [optical] pings.