The line products used in the ODN network include not only mature outdoor optical cables, ODF and other products, but also many new products suitable for FTTH.

From the perspective of construction, first of all, it is necessary to choose mature, stable and easy-to-construct line products. We generally divide the entire ODN network into three sections and four points, three sections: feeder section, distribution section, and household entry section; four points: machine room point, convergence point, access point, and user point.

Feeder section: Generally, different outdoor optical cables are used according to the actual situation. This is no different from the traditional metro optical network. It can be selected according to the plan (Note: G.652D fiber is used).

Distribution section: The distribution optical cable is used to connect the convergence point and the access point. For FTTH, a large number of indoor optical cables are used. At this time, it is necessary to pay attention to the use of optical cables that are convenient for indoor construction and have indoor optical cable specifications. , The direct application of ordinary outdoor optical cables indoors will increase the difficulty of construction and does not meet the relevant specifications of indoor optical cables.

Home entrance section: The home entrance optical cable is generally a butterfly-shaped optical cable, which has the strength equal to or higher than that of copper cable, and has the characteristics of low bending radius and easy construction, which makes the deployment of home optical cable close to copper cable.

Machine room: Generally, it is fiber jumper, distribution frame and other products. There are already large-capacity, high-density and easy-dispatch optical distribution frames abroad, which are more suitable for fiber management of large-capacity computer rooms. At present, due to design, craftsmanship and other reasons, there are no manufacturers that can launch better products, but MODF (Integrated Optical Distribution Frame) is a product that must be used in large-scale FTTH construction in the future. The industry is also actively exploring more suitable domestic products. Products used by operators.

Convergence point: The convergence point is where the feed optical cable is decomposed into a distribution optical cable. Generally speaking, it is a key node of a metropolitan optical network such as a planned optical crossover and a junction box, covering users in a certain area. Therefore, the products used need to take into account the needs of users in the coverage area, and the capacity needs to be guaranteed. In addition, the installation space of the optical splitter must be considered, and various high-density installation methods such as LGX optical splitter and high-density optical splitter can be used.

Access point: Also known as DP (Droppoint) point, it is a node where the distribution optical cable is decomposed into a household optical cable. This piece needs to cope with the complex user access environment and needs. It is the most variable link in the entire ODN network, and the product form is also rich and diverse. The general principle of use is to facilitate installation and operation, and to meet the requirements of users for quick access. Generally, it is a variety of indoor and outdoor cabinets, which have the ability to integrate optical splitters and the ability to use cold connection technology.

User site: The location of the end user, in line with various products used indoors by the user. The product structure is relatively simple, such as the FTTH terminal box, optical fiber information panel, and armor bending insensitive fiber jumper placed on the ONU. However, the product quality requirements are higher due to the placement at the user.

"Three paragraphs and four points" in ODN

Schematic diagram of FTTH and ODN network networking

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