Research on ONU Auto-discovery of EPON Systems

Discovery is the process that provides access to EPON to newly connected or disconnected ONUs.It is a precondition for the normal communication between ONU and OLT of an EPON system and result s in good scalability and convenient operation maintenance of PON systems. In this paper,we analyze the basic requirements of ONU auto-discovery,describe the whole process of auto-discovery in details, and compare two different schemes for register collision avoidance. The selection of register cycle is also analyzed results in an scheme for register collision avoidance based on register cycle.