By shop.szrollball.com | 16 March 2017 | 0 Comments
What is passive optical network (PON)? OLT (Optical Line Terminal) and ONT (Optical Network Terminal
A PON consists of an optical line terminal (OLT) at the service provider's central office (hub) and a number of optical network units (ONUs) or optical network terminals (ONTs), near end users. A PON reduces the amount of fiber and central office equipment required compared with point-to-point architectures. A passive optical network is a form of fiber-optic access network.
OLT (Optical Line Terminal)
The main function of OLT is to control the information float across the ODN, going both directions, while being located in a central office. Maximum distance supported for transmitting across the ODN is 20 km. OLT has two float directions: upstream (getting an distributing different type of data and voice traffic from users) and downstream (getting data, voice and video traffic from metro network or from a long-haul network and send it to all ONT modules on the ODN.
As we see from the figure, OLT is designed for controlling more than one PON (in this example it serves for four independent networks). For example, if every PON has 32 connections, OLT can distribute data to 128 ONTs. OLT has specific standard, so it would work with ONT from different manufacturers.
ONT (Optical Network Terminal), also ONU (Optical Network Unit)
ONT location, as seen from the figure, is at the customer’s premises. Its purpose is to use optical fiber for connecting to the PON on the one side, while interfacing with customers on the other side. ONT supports wide variety of interfaces, depending on requirements of customer.
Passive optical network (PON) is a telecommunications technology that implements a point-to-multipoint architecture, in which unpowered fiber optic splitters are used to enable a single optical fiber to serve multiple end-points such as customers, without having to provision individual fibers between the hub and customer.
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