Chapter 46 Troubleshooting
VMG/EMG/AM/DM/GM Series User’s Guide
472
I cannot connect to the Internet using a Fiber connection.
5 Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick
Start Guide.
The PON LED is off if the optical transceiver has malfunctioned or the fiber cable is not connected or is
broken or damaged enough to break the PON connection.
The LOS LED is red if the GPON Device is not receiving an optical signal.
The LOS LED blinks red if the GPON Device is receiving a weak optical signal.
6 Disconnect all the cables from your device and reconnect them. Make sure the fiber cable is not
curved too much.
7 If that does not work, restart your Zyxel Device.
8 If the problems continues, contact your ISP.
I cannot connect to the Internet using a cellular connection.
1 The DSL and Ethernet connections have priority in that order. If the DSL or Ethernet connection is up,
then the cellular connection will be down.
2 Make sure you have connected a compatible cellular dongle to the USB port, if required.
3 Make sure you have configured Network Setting > Broadband > Cellular Backup correctly.
4 Check that the Zyxel Device is within range of a cellular base station.
The Internet connection is slow or intermittent.
1 There might be a lot of traffic on the network. If the Zyxel Device is sending or receiving a lot of
information, try closing some programs that use the Internet, especially peer-to-peer applications.
2 Check the signal strength. Look at the LEDs, and check the LED section for more information. If the signal
strength is low, try moving the Zyxel Device closer to the ISP’s base station if possible, and look around to
see if there are any devices that might be interfering with the wireless network (such as microwaves,
other wireless networks).
3 Turn the Zyxel Device off and on.
4 If the problem continues, contact the network administrator or vendor, or try the advanced suggestions
in I cannot access the Web Configurator login screen.
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