FTTH (Fiber to The Home) is an optical fiber communication transmission method. The optical fiber is directly connected to the user's home (user required). Specifically, FTTH is to install the optical network unit (ONU) in a domestic user or enterprise users, it is a typical optical access network application type except for FTTD (Fibe to the Desk).

ODN (Optical Distribution Network) is fiber optic cable network based on PON FTTH. It is to provide the optical transmission channel between the OLT and ONU, and consist of all the passive optical fiber, passive components between the OLT and ONU.

ODN plays an important part in the whole FTTX network. It is the optical transmission channel linking the FTTH network between OLT and ONU. The mainly equipments includes fiber optic cable, fiber optic connector, fiber termination box,fiber splitter and more. The object of ODN construction is to realize economical, practical, flexible and reliable network coverage based on different scenarios, mainly to mainly to solve the selection of OLT and ONU location, spectroscopic methods, the mode and layout of optical fiber and cable, as well as the optical cable splice into the side and other related problems.

The ODN network equipment investment account for 23.8% of the entire FTTX network engineering, construction investment account for 27.2%, that is to say, the ODN network occupies the FTTX overall investment CAPEX 51%. Visible, ODN has become the key to the construction of FTTH network. The huge ODN construction has become a major challenge faced by the operators.

FAQs for ODN Construction

Why using optical path to test with OTDR will lead to OLT dropped?
In order to maintain the link between the OLT and the ONU, among which has similar heartbeat mechanism. Uplink light source intensity is too large to achieve maximum acceptance of the OLT, the OLT end accept is protected, or saturation, result in the OLT receives less than ONU sending the heartbeat to respond, and dropped.

What is the specific meaning of delay compensation and ranging?
When the OLT detected the ONU under the port of PON, it will measure the distance and obtain the delay of every ONU. After that, take other ONU to delay compensate to the maximum delay to get the maximum value, in this way, all the ONU will get the same distance.

PON, ODN, how to get the fault location fast and with the lowest cost?
Based on the SLA set of standard, fast and efficient positioning is bound to be costly. At present, the off-line testing is the Lowest-cost detection technology.

Can we spectroscopically mix the first and two class of FTTH ODN?
ODN in PON system (splitter and fiber) is a passive part, OLT and ONU is no perception of the specific structure of the ODN. ONU under different branches share equal status, only exist difference between the signal attenuation and delay.

How many ONU is a port of OLT connected to?
From the system point of view, you need to consider the uplink and downlink bandwidth on the OLT, the mac address learning number of OLT (lsw, fpga), of course, the hosted user bandwidth is also a factor to consider for a particular bandwidth applications.

What’s the impact of the upper and lower limit of the OLT and ONU optical power to the EPON transmission?
If the received optical power is greater than the upper limit of the optical module, it is likely to be burned out the module, if it is below the lower limit of the optical transceiver module, the OLT will find not ONU equipment. Besides, the optical module is with transmission distance limit, beyond the limited distance will result in failing to find the ONU.

As the major fiber optic manufacturer based in Shenzhen, China, Ingellen provides serious reliable and practical FTTX solutions and ranges of ODN or ODF required products including Rack/Wall Mount Enclosure, Fiber Termination Box, Cable Ties, Network Faceplate and more, all the products are with high quality and lifetime warranty. So you can enjoy your fiber life with peace of mind. Welcome to visit Ingellen official website to learn more: www.ingellen.com