Chapter 2 Hardware
AX/DX/EX/PX Series User’s Guide
46
LAN1-4  Green On The Zyxel Device has a successful Ethernet connection with a device 
on the LAN (Local Area Network) port.
Blinking The Zyxel Device is sending or receiving data to/from the LAN port.
Off The Zyxel Device does not have an Ethernet connection on the LAN 
port.
2.4G Green On The 2.4 GHz WiFi is activated.
Blinking The Zyxel Device is communicating with 2.4 GHz WiFi clients.
Amber Blinking The Zyxel Device is setting up a WPS connection with a 2.4 GHz WiFi 
client.
Off The 2.4 GHz WiFi network is not activated.
5G Green On The 5 GHz WiFi network is activated.
Blinking The Zyxel Device is communicating with 5 GHz WiFi clients.
Amber Blinking The Zyxel Device is connecting to 5 GHz WiFi clients via WPS.
Off The 5 GHz WiFi network is not activated.
Phone  Green On All phone ports are on-hook. An SIP account is registered for at least 
one phone port, and there is no voice message in the corresponding 
SIP account.
Blinking At least one telephone connected to one of the phone ports has its 
receiver off the hook or there is an incoming call. There is no voice 
message in the corresponding SIP account.
Amber On All phone ports are on-hook. A SIP account is registered for the phone 
port and there is a voice message in the corresponding SIP account.
Blinking At least one telephone connected to the phone port has its receiver 
off the hook or there is an incoming call. There’s voice message in the 
corresponding SIP account.
Off All phone ports are on-hook. The VoIP function is disabled, or there is 
no registered SIP account defined for any of the phone ports.
USB  Green On A device is connected to the USB port.
Off There is currently no device connected to the USB port.
Table 12   LED Descriptions (EX7501-B0) (continued)
LED COLOR STATUS DESCRIPTION