What is ONU (Optical Network Unit)
When it comes to ONU (Optical Network Unit) , we first introduce PON technology. PON technology has been developed since the 1990s. ITU (International Telecommunications Union) started from APON (155 M) and developed BPON (622 M). ), and to GPON (2.5 G); at the beginning of this century, due to the widespread use of Ethernet technology, IEEE has also developed EPON technology in Ethernet technology. Currently, PON technologies for broadband access mainly include EPON and GPON. The two standards are different. The EPON uplink and downlink bandwidth is 1.25 Gbit/s, the GPON downlink bandwidth is 2.5 Gbit/s, and the uplink bandwidth is 1.25 Gbit/s. The higher bandwidth in the future will be the 10 G EPON/10 G GPON developed on EPON/GPON technology.
PON is a single-fiber bidirectional optical access network using a point-to-multipoint (P2MP) structure. The PON system is composed of an optical line terminal (OLT), an optical distribution network (ODN), and an optical network unit (ONU) on the user side of the central office, and is a single-fiber bidirectional system. In the downstream direction (OLT to ONU), the signal sent by the OLT reaches each ONU through the ODN. In the upstream direction (ONU to OLT), the signal sent by the ONU will only reach the OLT and will not reach other ONUs. In order to avoid data collision and improve network efficiency, the uplink direction adopts TDMA multiple access mode, and manages data transmission of each ONU. The ODN provides optical channels between the OLT and the ONU.
The ONU is a terminal device of the PON technology and plays an important role in the PON technology. It is located between the ODN and the user equipment, and provides an optical interface between the user and the ODN and an electrical interface with the user side to implement various types of power. Signal processing and maintenance management. At present, the user ONU device, also known as the optical cat, is placed directly in the user's home.
The ONU is composed of a core layer, a service layer, and a public layer. The service layer mainly refers to user ports; the core layer provides multiplexing and optical interfaces; and the public layer provides power supply and maintenance management. The ONU is divided into an active optical network unit and a passive optical network unit. A device equipped with an optical receiver including an optical receiver, an upstream optical transmitter, and multiple bridge amplifiers is generally called an optical node. The PON is connected to the OLT using a single fiber and then the OLT is connected to the ONU. The ONU can access a variety of user terminals such as set-top boxes, wireless routers, televisions, etc., and has photoelectric conversion functions and corresponding maintenance and monitoring functions.
PON is a single-fiber bidirectional optical access network using a point-to-multipoint (P2MP) structure. The PON system is composed of an optical line terminal (OLT), an optical distribution network (ODN), and an optical network unit (ONU) on the user side of the central office, and is a single-fiber bidirectional system. In the downstream direction (OLT to ONU), the signal sent by the OLT reaches each ONU through the ODN. In the upstream direction (ONU to OLT), the signal sent by the ONU will only reach the OLT and will not reach other ONUs. In order to avoid data collision and improve network efficiency, the uplink direction adopts TDMA multiple access mode, and manages data transmission of each ONU. The ODN provides optical channels between the OLT and the ONU.
 |
| RicherLink RL842GWV-DGB GPON ONU |
The ONU is a terminal device of the PON technology and plays an important role in the PON technology. It is located between the ODN and the user equipment, and provides an optical interface between the user and the ODN and an electrical interface with the user side to implement various types of power. Signal processing and maintenance management. At present, the user ONU device, also known as the optical cat, is placed directly in the user's home.
The ONU is composed of a core layer, a service layer, and a public layer. The service layer mainly refers to user ports; the core layer provides multiplexing and optical interfaces; and the public layer provides power supply and maintenance management. The ONU is divided into an active optical network unit and a passive optical network unit. A device equipped with an optical receiver including an optical receiver, an upstream optical transmitter, and multiple bridge amplifiers is generally called an optical node. The PON is connected to the OLT using a single fiber and then the OLT is connected to the ONU. The ONU can access a variety of user terminals such as set-top boxes, wireless routers, televisions, etc., and has photoelectric conversion functions and corresponding maintenance and monitoring functions.
评论
发表评论