What are optical access network of OLT, ONU, ODN, ONT?

Optical access network is the access network with light as the transmission medium, replacing copper wire, used to access each home . Optical access network. Optical access network generally has three parts: optical line terminal OLT, optical network unit ONU, optical distribution network ODN, where OLT and ONU optical access network core components.


What is OLT?

OLT full name is Optical Line Terminal, optical line terminal, OLT is optical line terminal, is the telecom's local equipment, used to connect the fiber optic trunk line, the role is equivalent to the traditional communication network switch or router, is the entrance to the external network and the entrance and exit of the internal network of a device. Placed at the local end, the most important executive functions are traffic scheduling, buffer control, and the provision of user-oriented passive fiber optic network interface and allocation of bandwidth. To put it simply, it performs two functions: upstream, to complete the upstream access to the PON network; downstream, to send the acquired data to all ONU user terminal devices through the ODN network.


What is ONU?

ONU is Optical Network Unit The ONU has two roles: to selectively receive the broadcast sent by the OLT, if the data needs to be received to the OLT to receive the response; to collect and cache the Ethernet data that the user needs to send, according to the assigned sending window to send the cached data to the OLT side.

Different deployments of ONU access in FTTx networks also vary, for example FTTC (Fiber To The Curb): ONU placed in the central server room of the cell; FTTB (Fiber To The Building): ONU placed in the junction box of the building; FTTH (Fiber To The Home): ONU placed in the in the home user.


What is ONT?

ONT is Optical Network Terminal, which is the most terminal unit of FTTH, commonly known as "optical cat", similar to the electric cat of xDSL, ONT is the optical network terminal, which is applied to the end user, while ONU is the optical network unit, which may have other networks between it and the end user. ONT is a component of ONU.

What is the relationship between ONU and OLT?

OLT is the management side and ONU is the terminal; the service opening of ONU is all sent down through OLT, and the two are master-slave relationship. Multiple ONUs can be connected under one OLT through splitters.


What is ODN?

ODN is Optical Distribution Network, ODN is FTTH optical cable network based on PON equipment. It is the physical channel for optical transmission between OLT and ONU, and its main function is to complete the bidirectional transmission of optical signals, usually consisting of fiber optic cable, optical connector, optical splitter and supporting equipment for installing and connecting these devices, of which the most important part is splitter.

From function to function, ODN can be divided into four parts: feeder cable subsystem, wiring cable subsystem, entry line cable subsystem and fiber optic terminal subsystem.


As a manufacturer of fiber optic communication products, especially in the production of ODN products, Guangdong Changcheng Communication Company has rich experience, the company always insists on innovation, and constantly introduces products to meet the market demand.

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