ZYXEL VMG3625-T20A (01) PDF Document

The default login details for your ZYXEL VMG3625-T20A are as follows:

The user guide for your ZYXEL VMG3625-T20A uses specific conventions for warnings and notes:

Warnings: These tell you about things that could harm you or your device.

Note: These tell you other important information, such as configuration tips or recommendations.

To make your ZYXEL VMG3625-T20A more secure and to manage it more effectively, you should regularly do the following:

Change the password: Use a password that’s not easy to guess and that consists of different types of characters, such as numbers and letters.

Write down the password and put it in a safe place.

Back up the configuration (and make sure you know how to restore it): Restoring an earlier working configuration may be useful if the device becomes unstable or even crashes. If you forget your password, you will have to reset the ZYXEL VMG3625-T20A to its factory default settings. If you backed up an earlier configuration file, you would not have to totally re-configure the device. You could simply restore your last configuration.

The following table describes the LED indicators for the ZYXEL VMG3625-T20A. Note that if none of the LEDs are on, the device is not receiving power.

If the wireless network is turned off, press the WiFi button. Check the WLAN/WPS LED on the front panel to see if the wireless network is active.

You can also use the WPS button to quickly set up a secure wireless connection between the ZYXEL VMG3625-T20A and a WPS-compatible client by adding one device at a time.

To activate WPS:

1. Make sure the POWER LED is on and not blinking.

2. Press the WPS button and release it.

3. Press the WPS button on another WPS-enabled device within range of the ZYXEL VMG3625-T20A. The WLAN/WPS LED flashes amber while the device sets up a WPS connection with the other wireless device.

4. Once the connection is successfully made, the WLAN/WPS LED shines blue or green.

To turn off the wireless network, press the WiFi button. The WLAN/WPS LED turns off when the wireless network is off.

For the ZYXEL VMG3625-T20A model, press the WLAN button for more than two seconds and the WPS button for more than five seconds.

If you forget your password or cannot access the Web Configurator, you will need to use the RESET button to reload the factory-default configuration file. This means that you will lose all configurations that you had previously. The password will be reset to the factory default (see the device label), and the LAN IP address will be “192.168.1.1”.

1. Make sure the POWER LED is on (not blinking).

2. To set the device back to the factory default settings, press the RESET button for five seconds or until the POWER LED begins to blink and then release it. When the POWER LED begins to blink, the defaults have been restored and the device restarts.

To use the Web Configurator, an HTML-based management interface, you need to allow web browser pop-up windows, JavaScript (enabled by default), and Java permissions (enabled by default).

1. Make sure your ZYXEL VMG3625-T20A hardware is properly connected.

2. Launch your web browser. If the device does not automatically re-direct you to the login screen, go to http://192.168.1.1.

3. A password screen displays. Select the language you prefer.

4. To access the administrative Web Configurator, type the default username admin and the randomly assigned default password (see the device label) in the password screen and click Login. If you have changed the password, enter your new password and click Login.

5. The first time you log in, a screen will prompt you to change your password. Enter a new password, retype it to confirm, and click Change password. If you prefer to use the default password, click Skip.

6. The Wizard screen displays. Use the Wizard screens to configure the time zone, basic Internet access, and wireless settings. After the wizard, the Connection Status page appears.

You can use the Wizard screens to configure your ZYXEL VMG3625-T20A’s time zone, basic Internet access, and wireless settings.

1. Click the Wizard icon in the side bar to open the Wizard screens. Click Let’s Go to proceed with settings. You can also click Skip to leave the Wizard screens.

2. Time Zone: Select the time zone of your location and click Next.

3. Internet: Connect an Ethernet cable, a DSL cable, or a USB dongle. The device will check the Internet status automatically. Click Next. If the connection is successful, it will proceed. If it’s unsuccessful or the information is incorrect, you may need to enter your connection information manually.

4. Wireless: Turn the wireless LAN on or off. If you keep it on, record the security settings. You can choose to use the same SSID for 2.4GHz and 5GHz networks by checking the corresponding box. Click Done.

Your ZYXEL VMG3625-T20A will save your settings and attempt to connect to the Internet.

If your ZYXEL VMG3625-T20A does not turn on, follow these steps:

1. Make sure the ZYXEL VMG3625-T20A is turned on.

2. Make sure you are using the power adaptor or cord included with the device.

3. Make sure the power adaptor or cord is connected to the device and plugged in to an appropriate power source. Ensure the power source is turned on.

4. Turn the ZYXEL VMG3625-T20A off and on.

5. If the problem continues, contact the vendor.

If an LED on your ZYXEL VMG3625-T20A is not behaving as expected, please perform the following checks:

1. Make sure you understand the normal behavior of the LED by referring to the LED description table.

2. Check the hardware connections.

3. Inspect your cables for damage. Contact the vendor to replace any damaged cables.

4. Turn the ZYXEL VMG3625-T20A off and on.

5. If the problem continues, contact the vendor.

If you have forgotten the IP address for your ZYXEL VMG3625-T20A, follow these steps:

1. The default LAN IP address is 192.168.1.1.

2. If you changed the IP address and have forgotten it, you can find it by looking up the default gateway for your computer. In most Windows computers, click Start > Run, enter cmd, and then enter ipconfig. The IP address listed for the Default Gateway may be the IP address of your device.

3. If this does not work, you will have to reset the device to its factory defaults.

If you have forgotten the password for your ZYXEL VMG3625-T20A, try the following:

1. Check the cover page of the user guide or the device label for the default login names and associated passwords.

2. If the default credentials do not work, you will have to reset the device to its factory defaults.

If you cannot access the login screen for your ZYXEL VMG3625-T20A, follow these troubleshooting steps:

1. Make sure you are using the correct IP address. The default is 192.168.1.1. If you changed it, use the new IP address.

2. Check the hardware connections and ensure the LEDs are behaving as expected.

3. Make sure your Internet browser does not block pop-up windows and has JavaScript and Java enabled.

4. If possible, try to log in from another interface (like Telnet) and check the service control settings for HTTP and HTTPS under Remote Management.

5. Reset the device to its factory defaults and try to access it with the default IP address.

6. If the problem persists, contact the network administrator or vendor.

If you are unable to log in to your ZYXEL VMG3625-T20A, try these solutions:

1. Make sure you have entered the password correctly. The field is case-sensitive, so ensure Caps Lock is not on.

2. You cannot log in to the web configurator while someone is using Telnet to access the device. Log out of the other session or ask the other person to log out.

3. Turn the ZYXEL VMG3625-T20A off and on.

4. If this does not work, you must reset the device to its factory defaults.

If you cannot access the internet, follow these general troubleshooting steps:

1. Check the hardware connections and make sure the LEDs are behaving as expected.

2. Make sure you entered your ISP account information correctly in the Network Setting > Broadband screen. These fields are case-sensitive.

3. If you are trying to access the Internet wirelessly, make sure the wireless LAN is enabled on the ZYXEL VMG3625-T20A and your wireless client, and that the wireless settings match.

4. Disconnect all cables from your device and reconnect them.

5. The Ethernet WAN connection has priority over the DSL connection. If you have both connected, ensure the Ethernet WAN port is connected to a modem or router with active internet access.

6. If the problem continues, contact your ISP.

If your DSL internet connection is not working, try these steps:

1. Make sure the DSL WAN port is connected to a telephone jack (or the DSL/modem jack on a splitter).

2. Make sure you have configured a proper DSL WAN interface (Network Setting > Broadband screen) with the information provided by your ISP and that it is enabled.

3. Check that the LAN interface you are using is in the same interface group as the DSL connection (Network Setting > Interface Grouping).

4. If you set up a WAN connection using bridging service, make sure you turn off the DHCP feature in the LAN screen to allow clients to get WAN IP addresses directly from your ISP’s DHCP server.

The following factors may cause interference:

Obstacles: walls, ceilings, furniture, and so on.

Building Materials: metal doors, aluminum studs.

Electrical devices: microwaves, monitors, electric motors, cordless phones, and other wireless devices.

To optimize the speed and quality of your wireless connection, you can:

Move your wireless device closer to the AP if the signal strength is low.

Reduce wireless interference that may be caused by other wireless networks or surrounding wireless electronics such as cordless phones.

Place the AP where there are minimum obstacles (such as walls and ceilings) between the AP and the wireless client.

Reduce the number of wireless clients connecting to the same AP simultaneously, or add additional APs if necessary.

Try closing some programs that use the Internet, especially peer-to-peer applications.

If your ZYXEL VMG3625-T20A does not detect a connected USB device, follow these steps:

1. Disconnect the USB device.

2. Reboot the ZYXEL VMG3625-T20A.

3. If you are connecting a USB hard drive that comes with an external power supply, make sure it is connected to an appropriate power source that is on.

4. Re-connect your USB device to the ZYXEL VMG3625-T20A.

If, after rebooting your ZYXEL VMG3625-T20A, your computer cannot detect UPnP and refresh My Network Places > Local Network, follow these steps:

1. Disconnect the Ethernet cable from the ZYXEL VMG3625-T20A’s LAN port or from your computer.

2. Re-connect the Ethernet cable.

If the Local Area Connection icon for UPnP disappears in the screen, restart your computer.