Optical Distribution Network (ODN)
The optical distribution network is all the passive fibre infrastructure between the OLT and the customers' ONTs, including cables, splitters, connectors and enclosures.
What is Optical Distribution Network (ODN)?
The ODN is the physical path that PON signals travel. It is made of five segments: feeder fibre, optical distribution point, distribution fibre, optical access point and drop fibre. It contains fibre cables, connectors, passive splitters, splice closures, cabinets, patch cords and adapters. Because it is passive, the ODN has no powered equipment in the field, which lowers running costs, but its quality directly affects the performance, reliability and capacity of the whole PON.
How it works
Feeder fibre runs from the ODF in the exchange to the distribution point (the FDT). Distribution fibre continues to access points (FATs). Drop fibre then connects each access point to individual customers' ONTs. Typical reach is up to about 20 km, and some systems go further.