indicators blink once. The router is reset successfully. 
It is gigabit auto-negotiation Ethernet port, used to connect this router to the 
internet, such as a LAN port from the modem or the Ethernet jack provided by your 
ISP. 
1/2 (AC21 & AC23) 
1/2/3 (AC19) 
They are gigabit auto-negotiation LAN ports, used to connect to the wired devices 
such as computers or switches. 
IPTV/3 (AC21 & AC23) 
IPTV/4 (AC19) 
It is a gigabit auto-negotiation Ethernet port. By default, it is a LAN port. 
If the IPTV function of the router is enabled, it serves only as an IPTV port used to 
connect to a set-top box. 
It is USB 2.0 port, used to connect to USB device.