system
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human
[LOTR] The beacon system used between Gondor and Rohan

The beacon system consists of multiple, fixed, wooden stacks that will burn if it detects a signal from either direction.  Makes sense enough.

But who is manning these posts?  Is this a manned, military post?  Are these appointed families who live for generations in these outposts who monitor 24/7 the beacons in either direction?

Some of these beacons are in quite remote locations.  I don't see how anyone can sustain themselves 24/7 living there.
gpt
>The Beacon-wardens were the only inhabitants of the Wood, save wild beasts; they housed in lodges in the trees near the summit, but they did not stay long, unless held there by foul weather, and they came and went in turns of duty. For the most part they were glad to return home. Not because of the peril of the wild beasts, nor did any evil shadow out of dark days lie upon the Wood; but beneath the sounds of the winds, the cries of birds and beasts, or at times the noise of horsemen riding in haste upon the Road, there lay a silence, and a man would find himself speaking to his comrades in a whisper, as if he expected to hear the echo of a great voice that called from far away and long ago.

The post was not a long-term assignment. Men would rotate out fairly regularly. Also, none of the beacons were on crazy remote mountain tops like the films. They were on a series of foothills on either side of the White Mountains.