Ring light on the satellite

Just installed my Orbi RBK50 and RBS50 last night.  The instructions say that the ring light on top of the RBS50 will be blue if there's a good connection with the router.  This is what happened - it glowed blue and everything seems to work well, but when I checked the RBS50 a couple hours later the ring light was not lit.  The power light on the back is on, but the ring light is not on.  Is this normal?  Does the ring light on the RBS50 only come on when it's detecting the router?  Or, should it stay on all the time?

Thanks!