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The mysterious OLT&ONT

Views : 4857
Author : Toptel
Update time : 2021-11-12 16:46:24
Why is OLT&ONT so mysterious,because most people don’t know what it is, and only those who specialize in this area of research or work know their true colors.Let us uncover this "unusual" thing together.
       
OLT: Optical line terminal, which is a terminal device used to connect optical fiber trunk lines. The function is that in the EPON system, the OLT is not only a switch or router, but also a multi-service providing platform. It provides optical fiber interfaces for passive optical networks. In addition to supporting traditional voice, ordinary telephone lines and other types of T1/E1 interfaces, It also supports SONET connections at ATM and FR rates.
ONT: An optical network terminal used on the user side, which is part of the ONU. The function is to be directly at the user end, which can be connected to the gateway device of xDSL (adsl, vdsl) or Ethernet access port, and then connected to the network terminal.    

The hardware design of OLT system usually consists of three parts: backplane, main control board and single-board OLT. The backplane is mainly used to connect multiple OLT single boards and the main control board. In actual projects, it can be designed as 4 single boards or 20 single boards. The main control board is mainly used to realize the control and management of multiple OLT boards, and realize the centralized management of ONU, remote monitoring, remote commissioning and maintenance, and remote online upgrade services. The optical access network is an access network that uses light as the transmission medium, instead of copper wire, used to access each family. The optical access network is composed of OLT (Optical Line Terminal) and ONU (Optical Network Unit, Optical network unit) and ODN (Optical Distribution Network, optical distribution network) three parts; OLT and ONU are the core components of the optical access network. The core component of the optical access network. The OLT is the core component of the optical access network, equivalent to the switch or router in the traditional communication network, and is also a multi-service providing platform. It is generally placed at the central office to provide a user-oriented optical fiber interface for a passive optical fiber network. Its main functions are: Connect the upper layer network to complete the upstream access of the PON (Passive Optical Network) network. Through the ODN network (consisting of optical fiber and passive optical splitter), it is connected to the ONU of the user-end equipment. Realize the functions of control, management and ranging of the ONU of the user end equipment. Generally speaking, an ONT is an ONU, which is an optical network terminal used at the user end. However, strictly speaking, the ONT should be part of the ONU. The difference between an ONT and an ONU is that an ONT is an optical network terminal and is directly located at the user end, while an ONU is an optical network unit, and there may be other networks, such as Ethernet, with the user. The ONU can be connected to the gateway device of xDSL (adsl, vdsl) or Ethernet access port, and then connected to the network terminal.
 

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