What are the main system functions performed by onu?

The main system functions completed by onu are: 1. Select to receive the broadcast data sent by the OLT; 2. Respond to the ranging and power control commands issued by the OLT, and make corresponding adjustments; 3. The user's Ethernet The data is cached and sent in the upstream direction in the sending window allocated by the OLT; 4. Other related Ethernet functions.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

onu (OpticalNetworkUnit, optical network unit) refers to the optical network equipment connected to the branch optical fiber of the ODN.

ONU is a user-side device of the access network, providing users with various UNI interfaces such as telephone, data communication, and images.

ONU provides multiple service interfaces to users. Its network side is an optical interface and the user side is an electrical interface. Therefore, the optical network unit (ONU) needs to have the functions of optical/electrical conversion and electrical/optical conversion, and also has the function of digital/analog and analog to voice signals. /digital conversion function as well as multiplexing, signaling processing and maintenance management functions.

The main system functions completed by ONU are:

• Select to receive the broadcast data sent by the OLT

• Respond to the ranging and power control commands issued by the OLT, and make corresponding adjustments

• Cache the user's Ethernet data and store it in the OLT Send in the assigned sending window in the upstream direction

• Other related Ethernet functions

ONU device classification

• Active optical network unit

  Active optical network unit is mainly used in the integration of three networks. It integrates CATV full-band RF output; high-quality VOIP audio; Three-layer routing mode, wireless access and other functions can easily realize triple-network integration terminal equipment access.

• Passive optical network unit

  Passive optical network unit is the user-side device of the GPON (Gigabit Passive Optical Network) system. Through PON (Passive Optical Fiber Network) is used to terminate services transmitted from OLT (Optical Line Terminal). Cooperating with OLT, ONU can provide various broadband services to connected users. Such as Internet surfing, VoIP, HDTV, VideoConference and other services. As the user-side equipment for FTTx applications, ONU is a high-bandwidth and cost-effective terminal equipment necessary for the transition from the "copper cable era" to the "optical fiber era". As the ultimate solution for user wired access, GPON ONU will play a decisive role in the overall network construction of NGN (Next Generation Network) in the future.

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