What is an industrial ONU?

ONU (Optical Network Unit) optical network unit, industrial-grade ONU is divided into active optical network unit and passive optical network unit. Generally, devices equipped with network monitoring including optical receivers, upstream optical transmitters, and multiple bridge amplifiers are called optical nodes. The PON uses a single optical fiber to connect to the OLT, and then the OLT connects to the ONU. Industrial-grade ONU provides services such as data, IPTV (i.e. interactive network television), and voice (using IAD, i.e. Integrated Access Device), truly realizing "triple-play" applications.

The industrial-grade ONU has two functions: it selectively receives the broadcast sent by the OLT, and responds to the OLT if it needs to receive the data; collects and buffers the Ethernet data that the user needs to send, according to the assigned sending window Send the buffered data to the OLT.

The application of industrial-grade ONU can effectively improve the uplink bandwidth utilization of the entire system, and can also configure the channel bandwidth according to the network application environment and applicable service characteristics, and carry as many end users as possible without affecting the communication efficiency and communication quality, and improve Network utilization rate reduces user costs.

In general, ONU devices can be classified according to multiple application scenarios such as SFU, HGU, SBU, MDU, and MTU.

1. SFU ONU deployment

The advantage of this deployment method is that the network resources are relatively abundant, which is suitable for independent households in the FTTH scenario, and can ensure that the user end has a wide range of

ONU

With access function, but does not involve more complicated home gateway functions. The SFU in this environment has two common forms: Provides both an Ethernet interface and a POTS interface; only provides an Ethernet interface. It should be noted that SFU can provide coaxial cable functions in both forms to facilitate the realization of CATV services. It can also be used with a home gateway to provide value-added service functions. This scenario is also applicable to companies that do not need to exchange TDM data.

2. HGU type ONU deployment

The HGU type ONU terminal deployment strategy is similar to the SFU type, except that the functions of the ONU and RG are integrated in hardware. Compared with SFU, it can realize more complicated control and management functions. In this deployment scenario, the U-shaped interface is built into the physical device and does not provide an interface. If xDSLRG-type equipment needs to be provided, multiple types of interfaces can be directly connected to the home network, which is equivalent to a home gateway with an EPON upstream interface. Used in FTTH occasions.

3. SBU-type ONU deployment

This deployment plan is more suitable for independent enterprise users to construct the network under the FTTO application mode, and is based on the enterprise change of SFU and HGU deployment scenarios. The network in this deployment environment can support broadband access terminal functions, and provide users with multiple data interfaces including El interface, Ethernet interface, and POTS interface, which can meet the needs of enterprises in data communication, voice communication, and TDM dedicated line services. Usage requirements. The u-type interface in the environment can provide enterprises with a frame structure with multiple attributes, which is more powerful.

4. MDU type industrial-grade ONU deployment

This deployment scheme is suitable for multi-user FTTC, FTTN, FTTCab, FTTZ and other multi-application modes of network construction. If enterprise-level users have no demand for TDM services, they can also use this solution for EPON network deployment. This deployment scheme can provide broadband data communication services including Ethernet/IP services, VoIP services, and CATV services for multiple users, and has powerful data transmission capabilities. Each of its communication ports can correspond to a network user, so in comparison, its network utilization rate is higher.

5. MTU-type industrial-grade ONU deployment

The deployment plan is based on the commercialization of the MDU deployment plan. It can provide multi-enterprise users with multiple interface services including Ethernet interfaces and POTS interfaces, and can meet enterprise voice, data, TDM private line services and other services demand. If combined with the slot type implementation structure, richer and more powerful business functions can be realized.