ONU Internet access function introduction

As a network communication device, ONU plays the same role as routers and switches, and both are devices that transmit data. The difference is that ONUs can be centrally managed, and data is transmitted to upper-level equipment through optical fibers.

The ONU can be used normally. To enable the devices connected to the ONU wifi and network port to access the network normally, the following basic configuration process is required:

Step 1: ONU must be successfully registered on the OLT

Step 2: The OLT must issue the configuration of related service channels to the ONU, such as uplink bandwidth, service VLAN ID channel and other configurations (ONU WAN configuration, DHCP/PPPOE, VLAN ID, wifi and other configurations are private configurations and use third-party chips. The developed ONU does not support)

Step 3: Log in the ONU management web manually to configure wan connection, Vlan ID, DHCP/PPPOE and other configurations.

Note: Chinese operators generally use TR069 for configuration, or pre-fabricate these configurations into the ONU software by default when the ONU leaves the factory.

Overseas customers often log in remotely to ONU to manage web configuration wan connection, Vlan ID, DHCP/PPPOE and other configurations

Step 4: After the ONU is configured, the IP of the operator’s DHCP/PPPOE server can be normally obtained, and then you can connect to the network port of the ONU or connect to the wifi of the ONU to access the network.

On the ONU equipment, there are generally only two interfaces that mainly provide customers to connect to the Internet: Ethernet port and wifi. The user mainly accesses the network by connecting these two ports.


The network port is called RJ45 interface, it can also be called ETH port, or it can be called LAN interface. At present, the network port of ONU has 10M/100M adaptive (FE network port) and 10M/100M/1000M adaptive network port (GE network port). It can be said that any device that has a network port and needs to transmit data can be connected to the ONU for network data transmission.

For example, connect computers, routers, switches, set-top boxes, printers, cameras and other devices with network ports, and provide these devices with access to the Internet to transmit data. (Routers or switches need to be cautious. Connecting to an ONU may form a network loop, causing link network congestion, delays in Internet access, etc., which can cause the entire network to be paralyzed)


We have different network port types on different ONUs, such as 1GE, 1GE+1FE, 1GE+3FE, 4GE and other network port combinations. These combinations require the main chip support of the ONU. For example, our BT-211XR model ONU uses a 9602C chip, which only supports 2 network ports (1 FE and 1 GE), and does not support expansion to 3 network ports or 4 networks. It does not support expansion into 2 GE network ports. If you need support, you need to choose other types of main chips.

  • Realtek RTL9601B/RTL9601D chip, maximum support 1GE;
  • Realtek RTL9602C chip, maximum support 1GE+1FE;
  • Realtek RTL9603C chip, maximum support 1GE+3FE;
  • Realtek RTL9607C chip, maximum support 4GE;


How the ONU connects to the network

What is an IP address

IP address (Internet Protocol Address) refers to Internet Protocol address, which is also translated as Internet Protocol address.

The IP address is used to give a number to a computer (or Ethernet communication device) on the Internet. What everyone sees daily is that every networked PC needs an IP address in order to communicate normally. We can compare “personal computer” to “a telephone”, then “IP address” is equivalent to “telephone number”, and the router in the Internet is equivalent to the “program-controlled switchboard” of the telecommunications bureau.


How to obtain an IP address

The IP address of the network device needs to be assigned by the server of the front-end device, such as a DHCP server or a PPPOE server. The DHCP server and PPPOE server are generally set up on the core router, and the core router assigns IP addresses uniformly, so as to avoid IP address conflicts (same) in the same network, resulting in devices unable to access the Internet.

Generally, the IP address of the ONU connected to the network needs to be obtained from the front-end core router server (DHCP or PPPOE server). Therefore, the HGU type ONU basically integrates the client of DHCP and PPPOE, and the client requests the IP address that can connect to the network from the server.




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