Hello, everyone!
In today's topic, I will briefly explain ODN. Let's get started!
ODN stands for Optical Distribution Network. Each PON system consists of three segments:
OLT (Optical Line Terminal),
ODN (Optical Distribution Network), and
ONU (Optical Network Unit).
ODN is the largest and most expensive segment of the PON system. It is estimated that the cost of materials and construction of the ODN network is about 70% of the system.
ODN consists of three segments:
Feeder optical cable or feeder segment. It is located from the CO (Central Office) or headend to the optical distribution point. A feeder optical cable is a cable of high capacity, ie a large number of optical fibers. These are usually fiber optic cables from min 48F to 288F or higher. In CO or headend termini in rack cabinet – ODF (Optical Distribution Frame). At the other end, they end up in the optical distribution box or, less commonly, the optical closure. There are different types of optical closures and optical distribution cabinets/boxes.
Optical distribution cables or distribution segment. It is located between the optical distribution point and the optical access point. These are optical cables that have significantly less optical fiber than feeder optical cables. They have less than 12F or 24F. And often 2F or 4F. Both ends of the optical cable are most often in the appropriate optical cabinets or boxes.
Drop optical cables are the last segment of the ODN network. They are located between the optical access point and the ATB (Access Terminal Box) in the house/apartment. These cables usually have 1 or 2 optical fibers. There are different variants of drop optical cable - with messenger wire, without messenger wire, with or without optical connectors, invisible optical cables (invisible technology), etc. Optical connectors are usually SC/APC (required if CATV service is offered) or SC/PC. The ONT connects to the ATB using a patch cord optical cable.
This is the end of this topic. I hope you learned something new!
Thank you!
