Subject: What do the LED lights on the RJ45 port mean?
Explanation: The AT-HDR-EX-70-2PS has LED lights on the RJ45 (CAT) ports of the unit. These lights are not intended to serve any troubleshooting or diagnostic purpose. Instead, the LINK light will flash if there are connection issues between the TX and RX. Please see this article for troubleshooting help.
Article ID: KB01280