Introduction of FTTx

Technology of FTTx


Below you will find an excerpt of a Whitepaper explaining FTTx in Detail. To read the whole 11-page complimentary document, please click here: Glasfasernetze FTTx Solution White Paper.

Fiber access is one of the most important technologies in the next generation network. It increases the access layer bandwidth and builds a sustainable-development access layer network. OAN (Optical Access Network) adopts technologies: active point-to-point (P P) Ethernet and passive optical network (PON).

At the earlier stage, P P adopted dual Tx and Rx fibers to the user. The fiber layout in pairs was difficult. With the development of wavelength division multiplexing (WDM), now in the PON technology, one fiber to the user has been realized. In the downstream direction, the wavelength is 1 0 nm, and in the upstream direction, the wavelength is 1 10 nm. PON is the optical access technology developed to support P MP (Point-to-Multi-Point) applications.

PON realizes PMP transmission through the POS (Passive Optical Splitter). The fiber connected to the OLT port is split through by the Splitter into multiple channels to the ONUs of different users. The distance between OLT and ONU is longer i.e. 0km. With the PON technology, the ODN (Optical Distribution Network) does not have active nodes. The feature of passiveness makes the network deployment flexible, because the equipment room and power supply are not needed. The following lists the advantages of PON:

• Reduced cost. The equipment and fiber at the CO are shared by users, so the cost is lower than of PMP. Because equipment room and power supply are not needed, the capital construction cost is greatly reduced. The cable distribution at the CO is easy.
• Easy maintenance. The active equipment is removed form the access network, so the effect from electromagnetic interference, thunder and lightning is reduced. Thus, the failure rate of the line and the external equipment is reduced. Therefore, the operation and maintenance cost is reduced.

PON is most widely accepted by main Operators in the world. It is first technology choice and the trend of OAN. So we analyze the FTTx networking models that based on the fiber cable and PON technology in this document.

To read the whole 11-page complimentary document, please click here: Glasfasernetze FTTx Solution White Paper.