[int_19h]

Distant communication is what establishes the setting in "Forest". At the very beginning, it is stated that the colony is 27 light years away - a frontier - and as the story progresses, there are hints that this is one of the reasons why the colonists can get away with brutalizing the local population, going far beyond the mandate that they have.

And then when they get the ansible midway through the story along with an inspection party that promptly reports their findings back to Earth, they start getting a steady stream of orders banning their various practices - slavery, violent reprisals etc. And when the local administration tries to implement some of those bans, the more hard-minded colonists deliberately provoke the natives into an open uprising by massacring their village. So it's a major plot driver, too.