ETHERNET PASSIVE OPTICAL NETWORK SYSTEM AND METHOD FOR IMPLEMENTING END-TO-END TRANSPARENT CLOCK IN SUCH SYSTEM

摘要

A method for implementing an End-to-End Transparent Clock (E2ETC) in an Ethernet Passive Optical Network (EPON) system is disclosed by the present invention. The method includes: when receiving a Precision Time Protocol (PTP) message, a first network element records a first time when receiving the PTP message, sets the recorded first time in the PTP message and transmits the PTP message to a second network element; and the second network element receives the PTP message, and the PTP message, which will be transmitted to a lower device or an upper device, carries the residence time of the PTP message which is calculated according to the first time and the current time. The EPON system is also disclosed by the present invention. With the present invention, the E2ETC function in the IEEE1588-2008 protocol can be implemented in the condition of without extra hardware assistance.