[Ignitionnet]

Huh. You learn something new about how the individual networks are built every day. Though I say that my exposure to networks was in a different area built on largely underground plant.

That looks like a bridge amp, big fat input and multiple outputs, along with a DC injector to power line extenders.

There's no need for nodes to be actively cooled or have vents. Those guys are meant to live on poles or whatever and should be good with passive, or no, cooling.

The only stuff that absolutely needs cooling is the MSANs along with any transport and core optical network that may be going through the area.

Again though it seems that the level of variation between build is pretty large.