The ODN network is the basis for FTTH deployment

The ODN network refers to the transfer box between the trunk cable and the feeder cable, the trunk cable and the feeder cable, the optical fiber splitter, And the fiber splitter box in the building from the FTTH local terminal device OLT To The onu of the ftth user terminal device) introduce a network composed of optical cables, optical connectors, and optical information boxes/panels, in the ODN network, the investment in cables, supporting facilities, and engineering construction occupies more than 80% of the initial investment in the FTTH Network, and the construction period is long. Therefore, it is no exaggeration to say that the ODN has become the third fixed network operator.

At the same time, the ODN must be used reliably for more than 20 years. Therefore, the quality of related facilities and construction must be ensured. If the fault occurs frequently due to quality problems, the solution is extremely difficult. In the entire ODN network, the highest cost and construction requirements are the residential segments in the building. Over 80% of the total cost of the ODN line is concentrated in this segment, compared with the traditional copper wire assembly, the welding and terminal work in the cable assembly and maintenance process is more professional, and the requirements for instrumentation, tools, and personnel are very high. In actual deployment, non-standard installation causes small bending radius of optical fiber, bubbles in Optical Fiber fusion, and other issues that affect the quality of ODN. Therefore, in order to reduce the entire FTTH Network Construction Cost and compress the construction cycle, it is necessary to use a unified ODN equipment, construction standards, specifications, and efficient planning and design tools, and optimize the project construction management process.

The construction of FTTH access optical cable network should be able to meet the medium-and long-term needs of various businesses of individual, household, government and enterprise customers in full business conditions. In the future, the access optical fiber networks in urban areas will be divided into three layers: trunk, wiring, and introduction. When the OLT is centralized in the terminal, the trunk layer of the connected optical cable should adopt a ring + star tree structure. The ring structure adopts a ring-free fiber configuration method, which mainly carries important government and enterprise customers, 3G base stations, and access network points that have high security requirements; the star tree structure mainly carries users or businesses with low security requirements, such as small and medium-sized government and enterprise customers, video monitoring sites, and public customers FTTB/H. In the FTTH mode, the optical splitting mode can be flexibly selected based on different scenarios: the customer requirements for new residential buildings and buildings are relatively clear, and the primary level optical splitting structure should be used; FTTH transformation of existing residential areas, the secondary optical splitting structure can be used.

For FTTH line construction, FTTH line construction in the new urban area should be carried out during the same period in conjunction with building pipeline laying, FTTH engineering construction should be built to the first optical fiber information point integrated information box or optical fiber panel of the user's home), and the installation personnel should install the terminal according to the user's business activation application. The existing FTTH transformation should focus on thin coverage, that is, a large-capacity optical cable distribution frame/optical cable transfer box should be set up in the residential data center or underground high-rise buildings. the ODN project will deploy Optical splitter and optical cable to the floor, the installation and maintenance personnel can perform horizontal and household Optical Fiber installation and ONU installation based on the actual acceleration requirements of the transformed users.