At the present

Gigabit Passive Optical Network（GPON）broadband access is an ideal approach to tri-network（voice

video and high-speed data）convergence or triple play.This paper presents a PAS7401V-based Optical Network Unit（ONU）voice

data and video service access implementation method.In this method

voice access is implemented by using Voice over Internet Packet（VoIP）scheme

which ensures the QoS of voice transmission and the service interface conform to the relevant performance requirements;data is accessed over the 10/100/1 000Mbit/s Ethernet

so is video.It focuses on the design of PAS7401V-based ONU software and hardware and tests the system throughout

packet loss rate and forwarding latency in ONU systems

verifying the correctness of the design scheme

and voice interface performance test results indicate that the proposed scheme runs well on GPON.