ONU (Optical Network Unit) Optical network unit, ONU is divided into active optical network unit and passive optical network unit. Generally, the equipment equipped with optical receivers, uplink optical transmitters, and multiple bridge amplifiers for network monitoring is called an optical node. PON uses a single optical fiber to connect to OLT, and then OLT is connected to ONU. ONU provides services such as data, IPTV (Interactive Internet TV), voice (using IAD, Integrated Access Device), and truly realizes "triple-play" applications.
Overall, ONU devices can be classified according to various application scenarios such as SFU, HGU, SBU, MDU, and MTU.
1. SFU type ONU deployment
The advantage of this deployment method is that the network resources are relatively abundant, and it is suitable for independent households in the FTTH scenario. It can ensure that the user end has broadband access functions, but does not involve complex home gateway functions. The SFU in this environment has two common forms: providing both Ethernet ports and POTS ports; and providing only Ethernet ports. It should be noted that the SFU in both forms can provide coaxial cable functions to facilitate the realization of CATV services, and can also be used with home gateways to facilitate the provision of value-added services. This scenario is also applicable to enterprises that do not need to exchange TDM data
2. HGU type ONU deployment
The deployment strategy of the HGU type ONU terminal is similar to that of the SFU type, except that the functions of the ONU and the RG are integrated in hardware. Compared with SFU, it can realize more complex 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 equipment is required, multiple types of interfaces can be directly connected to the home network, which is equivalent to a home gateway with an EPON uplink interface. Applied to FTTH occasions.
3. SBU type ONU deployment
This deployment solution is more suitable for the network construction of independent enterprise users in the FTTO application mode, and it is an enterprise change based on the SFU and HGU deployment scenarios. The network under this deployment environment can support the broadband access terminal function and provide users with a variety of data interfaces including El interface, Ethernet interface, and POTS interface, which can meet the needs of enterprises in data communication, voice communication, and TDM private line services. Usage requirements. The U-shaped interface in the environment can provide enterprises with a frame structure with various attributes, and the function is relatively powerful.
4. MDU type ONU deployment
This deployment solution is suitable for network construction under multi-application modes such as multi-user FTTC, FTTN, FTTCab, and FTTZ. If enterprise-level users do not require TDM services, this solution can also be used for EPON network deployment. This deployment scheme can provide multi-users with broadband data communication services including Ethernet/IP services, VoIP services, and CATV services and other multi-service modes, and has strong 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 ONU deployment
This deployment solution is a commercial change based on the MDU deployment solution. It can provide multi-enterprise users with a variety of interface services including Ethernet interfaces and POTS interfaces, and can meet various services such as voice, data, and TDM leased line services of enterprises. need. If the slot-type implementation structure is used in combination, richer and more powerful business functions can be realized.
Post time: Jul-20-2023