1. Introduction
This manual provides comprehensive instructions for the setup, operation, and maintenance of your ZyXel VMG4380-B10A VDSL2 Gateway Modem. The VMG4380-B10A is a VDSL2 Gateway Modem with Gigabit Ethernet (GbE) and Wireless-N capabilities, designed to provide high-speed internet access and network connectivity. Please read this manual thoroughly before using the device to ensure proper installation and optimal performance.
2. Package Contents
Verify that your package contains the following items:
- ZyXel VMG4380-B10A VDSL2 Gateway Modem
- Power Adapter
- Ethernet Cable
- DSL Cable
- Quick Start Guide (if included)
3. Physical Overview
Familiarize yourself with the ports and indicators on your VMG4380-B10A modem.
3.1 Front Panel

Figure 1: Front Panel of ZyXel VMG4380-B10A Modem. This image displays the vertical black modem with an antenna at the top. The front panel features several LED indicators and a circular button at the bottom.
The front panel features several LED indicators that provide status information about the modem's operation:
- Power LED: Indicates the power status of the device.
- DSL LED: Indicates the status of the VDSL2 connection.
- Internet LED: Indicates internet connectivity status.
- WLAN LED: Indicates the status of the wireless LAN (Wi-Fi).
- LAN LEDs: Indicate activity on the wired Ethernet ports.
- USB LED: Indicates activity on the USB ports.
- WPS Button: Used for Wi-Fi Protected Setup to easily connect wireless devices.
3.2 Rear Panel
The rear panel typically contains the following ports for connectivity:
- Power Port: Connects to the included power adapter.
- DSL Port: Connects to your VDSL line from the wall jack.
- Ethernet Ports (LAN): Connects to computers, routers, or other network devices via Ethernet cables.
- WAN Port (GbE): For connecting to an external modem or fiber optic network, if applicable.
- USB Ports (USB 2.0, USB 3.0): For connecting USB devices such as storage or printers.
- Reset Button: Used to restore the modem to factory default settings.
4. Setup and Installation
Follow these steps to set up your ZyXel VMG4380-B10A modem.
- Connect the DSL Line: Connect one end of the DSL cable to the DSL port on the modem and the other end to your wall's DSL jack.
- Connect Ethernet Devices: Connect an Ethernet cable from one of the LAN ports on the modem to your computer or a router.
- Connect Power: Connect the power adapter to the modem's power port and then plug it into an electrical outlet.
- Power On: Press the power button (if available) or wait for the modem to power on automatically. The Power LED should illuminate.
- Wait for Synchronization: Wait for the DSL LED to become solid, indicating a stable DSL connection. Then, wait for the Internet LED to become solid, indicating successful internet connectivity. This process may take several minutes.
- Access Web Interface: Open a web browser on a connected computer and enter the default IP address (commonly 192.168.1.1) in the address bar. Log in using the default username and password (usually found on a sticker on the device or in the Quick Start Guide).
- Initial Configuration: Follow the on-screen wizard for initial setup, which may include setting up your internet service provider (ISP) details, Wi-Fi name (SSID), and password.
5. Operating Instructions
5.1 Basic Internet Access
Once the modem is successfully set up and the Internet LED is solid, your connected devices should have internet access.
5.2 Wireless Network (Wi-Fi)
To connect devices wirelessly:
- Find Network Name (SSID): On your wireless device (laptop, smartphone), search for available Wi-Fi networks. The default SSID is usually printed on a sticker on the modem.
- Enter Password: Select your network name and enter the Wi-Fi password (also known as the network key or WPA/WPA2 key), typically found on the same sticker.
- WPS Connection: Alternatively, press the WPS button on the modem and then activate WPS on your wireless device within two minutes to establish a connection without entering a password.
6. Maintenance
6.1 Firmware Updates
Periodically check the ZyXel support website for firmware updates for your VMG4380-B10A. Firmware updates can improve performance, add new features, and enhance security. Refer to the web interface's system tools or maintenance section for instructions on how to perform an update.
6.2 Factory Reset
If you encounter persistent issues or forget your login credentials, you can perform a factory reset.
- With the modem powered on, use a paperclip or a similar pointed object to press and hold the recessed Reset button on the rear panel for approximately 10-15 seconds.
- Release the button when the LEDs begin to flash or the modem reboots.
- The modem will restart with all settings restored to their factory defaults. You will need to reconfigure your internet and Wi-Fi settings.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power LED | Power adapter not connected or faulty. | Ensure the power adapter is securely connected to the modem and a working electrical outlet. |
| DSL LED is off or blinking | No DSL signal or unstable connection. | Check DSL cable connections. Ensure the cable is connected to the correct port. Contact your ISP if the issue persists. |
| Internet LED is off | No internet connection from ISP or incorrect settings. | Verify DSL LED is solid. Check ISP settings in the modem's web interface. Contact your ISP. |
| Cannot connect to Wi-Fi | Incorrect Wi-Fi password, Wi-Fi disabled, or signal interference. | Ensure correct SSID and password. Check WLAN LED. Try restarting the modem. Reduce distance to modem. |
| Slow internet speed | Network congestion, signal interference, or ISP issue. | Restart modem. Check for other devices consuming bandwidth. Contact your ISP to check line quality. |
8. Specifications
Key technical specifications for the ZyXel VMG4380-B10A VDSL2 Gateway Modem:
- Model: VMG4380-B10A
- Connectivity Technology: Gigabit Ethernet, VDSL2
- Wireless Standard: Wireless-N (802.11n)
- USB Ports: 1x USB 2.0, 1x USB 3.0
- Dimensions (LxWxH): 8 x 6 x 2 inches
- Weight: 1.1 pounds
- Color: Black
- Compatible Devices: Personal Computer, Laptop, Router
- Manufacturer: ZyXel
9. Warranty and Support
For warranty information and technical support, please refer to the warranty card included with your product or visit the official ZyXel support website. You can typically find drivers, firmware updates, and additional troubleshooting resources there.





