1. Introduction
The ZTE ZXHN F670L is a GPON Optical Network Terminal (ONT) designed for Fiber-to-the-Home (FTTH) and Fiber-to-the-Office (FTTO) broadband access networks. This device offers high-bandwidth capabilities, high reliability, and low power consumption, meeting the diverse needs of users for broadband internet, voice, data, and video services. It features dual-band Wi-Fi (2.4G and 5G) and multiple Gigabit Ethernet ports to provide a comprehensive networking solution.
2. Package Contents
Before proceeding with the installation, please verify that all items are present in your package:
- ZTE ZXHN F670L GPON ONT Unit
- Power Adapter (EU, US, UK, AU type, depending on region)
- Ethernet Cable
- Quick Start Guide (if included)
3. Device Overview
Familiarize yourself with the ports and indicators on your F670L ONT.

Front Panel Indicators:
- Power: Indicates power status.
- PON: Indicates GPON optical link status.
- LOS: Indicates loss of optical signal.
- Internet: Indicates internet connection status.
- LAN1-4: Indicate status of respective LAN ports.
- Phone: Indicates voice service status.
- Wi-Fi: Indicates Wi-Fi network status.
- WPS: Indicates WPS function status.
- USB: Indicates USB port status.

Rear Panel Ports:
- PON: Optical fiber connection port.
- Phone: RJ11 port for telephone connection.
- LAN1-4: RJ45 Gigabit Ethernet ports for wired network devices.
- Reset: Button to restore factory default settings.
- USB: USB port for external storage or other peripherals.
- Power: Power input port.
- On/Off: Power switch.
4. Setup Instructions
Follow these steps to set up your ZTE F670L ONT:
- Placement: Place the ONT in a central location to maximize Wi-Fi coverage. Ensure it is in a well-ventilated area, away from direct sunlight, heat sources, and obstructions.
- Connect Optical Fiber: Carefully connect the optical fiber cable from your service provider to the PON port on the rear of the ONT. Ensure the connector is clean and properly seated.
- Connect Power: Connect the provided power adapter to the Power port on the ONT and then plug it into an electrical outlet. Press the On/Off button to power on the device.
- Observe Indicator Lights: After powering on, observe the indicator lights on the front panel. The 'Power' light should be solid green. The 'PON' light should eventually turn solid green, indicating a successful optical link. The 'LOS' light should be off. The 'Internet' light should turn green once an internet connection is established.
- Connect Wired Devices (Optional): Connect your computers, smart TVs, or other wired network devices to the LAN1-4 ports using Ethernet cables.
- Connect Telephone (Optional): If you have voice services, connect your telephone to the Phone port.
- Initial Wi-Fi Connection: The default Wi-Fi network name (SSID) and password are usually printed on a label on the bottom of the ONT (refer to Figure 3). Use these credentials to connect your wireless devices.

5. Operating Instructions
The ZTE F670L is primarily managed through a web-based interface. You will need a computer connected to the ONT via Ethernet or Wi-Fi to access it.
5.1 Accessing the Web Management Interface
- Open a web browser (e.g., Chrome, Firefox, Edge).
- In the address bar, type the default IP address of the ONT (commonly 192.168.1.1 or 192.168.100.1) and press Enter. This information can usually be found on the product label.
- Enter the default username and password. These are also typically found on the product label or in the quick start guide.
5.2 Configuring WAN Connection
Once logged in, you can configure your internet connection settings. Navigate to the 'Network' section, then 'WAN Connection'.
Select the appropriate 'Service List' (e.g., INTERNET) and 'IP Version' (e.g., IPv4, IPv6, or IPv4/v6) as provided by your internet service provider.
5.3 Configuring Wi-Fi (WLAN) Settings
To manage your wireless networks, navigate to the 'Network' section, then 'WLAN Radio2.4G' or 'WLAN Radio5G'.

Here you can:
- Enable/Disable the wireless radio.
- Change the SSID (Wi-Fi network name).
- Set the authentication type (e.g., WPA/WPA2-PSK) and password.
- Adjust the channel for optimal performance.
5.4 Device Information
You can view detailed device information, including model, serial number, hardware version, and software version, under the 'Status' section, then 'Device Information'.

6. Maintenance
Proper maintenance ensures the longevity and optimal performance of your ONT.
- Cleaning: Keep the device clean and free from dust. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or aerosols.
- Ventilation: Ensure the ventilation holes are not blocked to prevent overheating.
- Environment: Operate the device within its specified temperature and humidity ranges. Avoid placing it in direct sunlight or near heat sources.
- Firmware Updates: Periodically check the ZTE support website or contact your service provider for available firmware updates. Firmware updates can improve performance, add new features, and fix bugs.
- Resetting the Device: If the device is not functioning correctly, you can perform a soft reset by powering it off and on. For more persistent issues, a factory reset can be performed by pressing and holding the 'Reset' button on the rear panel for about 10 seconds while the device is powered on. Warning: A factory reset will erase all custom configurations, and the device will revert to its default settings.
7. Troubleshooting
If you encounter issues with your ZTE F670L ONT, refer to the following common problems and solutions:
7.1 No Power
- Symptom: Power indicator is off.
- Solution: Check if the power adapter is securely connected to the ONT and the electrical outlet. Ensure the power switch is in the 'On' position. Try a different power outlet.
7.2 No Internet Connection
- Symptom: Internet indicator is off or red.
- Solution:
- Check the 'PON' and 'LOS' indicators. If 'LOS' is blinking or solid red, there might be an issue with the optical fiber connection. Contact your service provider.
- Ensure the optical fiber cable is properly connected to the PON port.
- Verify WAN settings in the web management interface are correct according to your service provider's specifications.
- Restart the ONT by powering it off and on.
7.3 Wi-Fi Not Working or Slow
- Symptom: Wi-Fi indicator is off, or wireless devices cannot connect, or connection is slow.
- Solution:
- Check if the 'Wi-Fi' indicator is solid green. If not, ensure Wi-Fi is enabled in the web management interface.
- Verify the Wi-Fi SSID and password on your devices match those configured on the ONT.
- Try changing the Wi-Fi channel in the web management interface to avoid interference.
- Ensure your devices are within the Wi-Fi range.
- Restart the ONT.
7.4 Cannot Access Web Management Interface
- Symptom: Browser cannot open the ONT's IP address.
- Solution:
- Ensure your computer is connected to the ONT via Ethernet or Wi-Fi.
- Verify the correct IP address is being used (check product label).
- Check your computer's network settings to ensure it's obtaining an IP address automatically (DHCP).
- Temporarily disable any firewall or antivirus software on your computer.
- Try a different web browser.
8. Specifications
| Feature | Description |
|---|---|
| Model Number | ZTE F670L |
| Type | ONU, FTTx Solutions |
| Brand Name | ZTE |
| Use | FTTH |
| Application | FTTH FTTB FTTX Network |
| Fiber Type | GPON |
| Configuration | 4GE + 1Tel. + 2.4G/5G Dual Band Wi-Fi |
| Antenna Gain | 5dBi |
| Power Adapter | EU, US, UK, AU etc. |
| Version | English |
| Condition | Brand New |
| Dimensions (L x W x H) | 20 cm x 13 cm x 30 cm (approximate) |
| Weight | 0.5 kg (approximate) |
9. User Tips
Here are some tips to enhance your experience with the ZTE F670L ONT:
- Optimal Placement: For the best Wi-Fi signal, place the ONT in an open area, centrally located within your home or office, and elevated if possible. Avoid placing it inside cabinets or near large metal objects.
- Utilize Dual-Band Wi-Fi: Connect newer devices that support 5GHz Wi-Fi to the 5GHz network for faster speeds and less interference. Use the 2.4GHz network for older devices or for extending range.
- Secure Your Network: Always change the default Wi-Fi SSID and password to a strong, unique password to protect your network from unauthorized access.
- Wired Connections for Stability: For devices that require stable and high-speed connections (e.g., gaming consoles, desktop PCs, streaming devices), use an Ethernet cable to connect them to the LAN ports.
- Regular Reboots: Occasionally restarting your ONT (power cycling it) can help clear temporary glitches and improve overall network performance.
10. Warranty and Support
The ZTE F670L GPON ONT typically comes with a 1-year warranty from the date of purchase. Please retain your proof of purchase for warranty claims.
For technical support, troubleshooting assistance beyond this manual, or warranty inquiries, please contact your service provider or the vendor from whom you purchased the device. They can provide specific guidance related to your network configuration and service plan.





