ODN Class A, B, and C are differentiated mainly on the optical transmitter power output and bit-rate optical receiver sensitivity. The Optical Distribution Network (ODN) is the passive fiber infrastructure that connects the central office OLT to each subscriber in FTTH, FTTB, and FTTO deployments. Unlike active equipment, the ODN does not require electrical power. Ever since its foundation in 1971, Cablescom has co ups due to the reliability and quality of its products. Satisfied clients from the main telecom and railway companies over 50 countries worldwide rely on our know-how for their cable. In this chapter, let us understand what Split Ratios, Maximum Reach and Traffic Management are in the Optical Distribution Network (ODN). The maximum permissible optical power attenuation between OLT optical ports to ONT input is 28dB, which is by utilizing the so-called Class B optical network. This white paper introduces an evolved methodology to manage FTTx Optical Distribution Network (ODN) performance. A centralized OTDR-based solution is the core of this evolved methodology, which greatly improves the visibility and operation efficiency in maintaining ODN quality and resilience.