AX/DX/EX/PX Series User’s Guide
29
CHAPTER 2
Hardware
2.1  Hardware
This section describes the front and rear panels for each model. If your model is not shown here, refer to 
the Zyxel Device’s Quick Start Guides to see the product drawings and how to make the hardware 
connections.
2.2  LED Indicators Panel
The following shows the Zyxel Device LED indicators panel and the LED behaviors.
None of the LEDs are on if the Zyxel Device is not receiving power.
2.2.1  AX7501
Figure 10   LED Indicators (AX7501-B0 / AX7501-B1)
Note: The 2.5G LAN and 2.5G WAN LEDs are only for the Ethernet router. 10G LAN is only for the AON and PON 
routers. See Section 1.1 on page 19 for more information.
The following are the LED descriptions for your AX7501.
Table 5   LED Descriptions (AX7501)
LED COLOR STATUS DESCRIPTION
POWER  Green On The Zyxel Device is receiving power and ready for use.
Blinking The Zyxel Device is self-testing.
Red On The Zyxel Device detected an error while self-testing, or there is a device 
malfunction.
Blinking The Zyxel Device is upgrading firmware.
Off The Zyxel Device is not receiving power.
2.5G WAN  Blue On The Zyxel Device has a successful 2.5 Gbps Ethernet connection on the 
WAN.
Green On The Zyxel Device has a successful 1 Gbps Ethernet connection on the WAN.
Off The Zyxel Device does not have an Ethernet connection with the WAN.
The LED will cycle Green > Blue > Off > repeat, when the Zyxel Device has 
an unsupported 100 Mbps Ethernet connection on the WAN.