Understanding ONU: The Optical Network Unit Explained

In the world of fiber optic communications, ONU (Optical Network Unit) plays a crucial role in connecting users to the network. ONU is a device that converts optical signals into electrical signals and vice versa, allowing for efficient data transmission. In this article, we will delve into the features of ONU, its role in FTTx, and the different types of ONU routers available in the market.

Features of ONU

ONU is a versatile device that offers several features, including:

1. Triple Play Service: ONU provides data, IPTV, VOIP, and other services, making it a comprehensive solution for users.

2. Receive broadcast data sent by OLT: ONU can receive broadcast data sent by the Optical Line Terminal (OLT), allowing for efficient data transmission.

3. Collect and cache Ethernet data: ONU collects and caches Ethernet data that needs to be sent by users and sends it to OLT according to the allocated sending window.

4. Abundant remote management capabilities: ONU offers abundant remote management capabilities supported by OAM (Operation, Administration, and Maintenance), ensuring efficient management and maintenance of the network.

Where is ONU in FTTx?

ONU can be placed in different locations depending on the FTTx (Fiber To The x) technology used. The different types of FTTx technologies include:

1. FTTC (Fiber To The Curb): ONU is placed in the central office of the community.

2. FTTB (Fiber To The Building): ONU is set down in the junction box in the corridor.

3. FTTN (fiber-to-the-node): ONU sits at the access point.

4. FTTH (Fiber To The Home): ONU is located in the family users’ house.

Types of ONU Routers

There are three types of ONU routers available in the market, each with its unique features and functions:

1. EPON ONU: EPON ONU adopts the MTK WiFi 5 chipset and USB 3.0, providing a speed of up to 1200Mbps. It also supports IPV4 and IPV6.

2. GPON ONU: GPON ONU has 4×10/100Mbps auto-adaptive Ethernet interfaces and 10/100M full/half RJ45 connectors. It supplies Reserve POE power from +12 to +24VDC.

3. xPON ONU (Dual Mode): xPON ONU adopts the MTK WiFi 5 chipset and USB 3.0, providing a speed of up to 1200Mbps. It also supports IPV4 and IPV6.

Conclusion

ONU is a crucial device in fiber optic communications, offering several features such as triple play service, receive broadcast data sent by OLT, collect and cache Ethernet data, and abundant remote management capabilities. ONU can be placed in different locations depending on the FTTx.