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【正文】 hich transmits in turn, the OLT receive timing recovery, the decision threshold establishment, the range finder and the time delay pensation quite is plex. Looked from the EPON/GEPON structure that, its essential merit Enormously simplified the traditional multilayered overlapping work Structure, the main characteristic included: Eliminated ATM and the SDH level, thus reduced the initial cost and the movement cost。 The downward service speed reaches as high as 1Gb/s, the permission support multiuser, each user39。s band width may be higher, and can provide video frequency professional ability and good QOS The hardware is simple, does not need outdoor electronic installation, and enables the installment deployment work to simplify。 May use the Ether technology mature chip massively, the realization is simple, the cost low improved the electric circuit to refer to the coordination service nimbly provision with the reshuffle ability. IEEE the standard GEPON technology standards is good, on the downward wave length is 1310 and 1490nm, on the downward speed is , the transmitting range is 10/20km, the bypass pared to is 16, the primary service is the data and the sound of talking, after increases a 1550nm visual broadcast wave length, bees the sound of talking, the data and the television method of threeinone “tripleplay” the wide band service colligation service, but this will be the future family service “the Assassin39。s mace application”. The EPON/GEPON main shorting is the efficiency low and supports outside the Ether with difficulty the service. The former is because uses 8B/10B the line code, introduces 20% band width loss, in addition other expenses, available load only about 50%, but APON and GPON all use NRZ to harass the code are the line codes, does not have the band width loss. In addition reasons and so on load bearing plate efficiency, transmission gathering plate efficiency, service adaptive efficiency, cause the EPON/GEPON total transmission efficiency to be very low, probably only is GPON half. 4. GPON In 2021, formulated EPON standard positively while IEEE, the FSAN anization starts to initiate the formulation speed to surpass 1Gb/s PON work standard 1,000,000,000,000,000 Ether passive light work (GPON), afterwards, ITUT also involved this new standard formulation work and 1 Dan (speed enhances in 2021 through two related GPON new standard and to ). According to this newest standard stipulation, GPON may provide and the speed and the all standard upward speed。 The transmitting range amounts to 20 kilometers at least, has the high speed highly effective transmission characteristic. Moreover, GPON has selected two seal methods, besides traditional ATM, but also has used one brandnew in the transmission gathering level based on sDH standard general group frame procedure GFP, this is one kind may transparently highly effective Seals the existing SDH work each kind of data signal the general standard signal adaptive mapping technology, may adapt any subscriber signal form and any transmission work service pattern, namely may according to the inherent form transmission pronunciation, the data and the video signal, does not need to attach ATM or the P seal level, has manifested the service provider prehensively to the provision of service nimble request, but APON/BPON and EPON/GEPON all need to provide the specific adaptive method to each kind of specific service. Because uses the GFP mapping, the GPON transmission gathering level essentially is a synchronization, enables GPON to be possible to support endtoend fixed time and other orbit service, specially may the direct high quality support the TDM service nimbly. From the technical angle, GPON is the BPON inheritance and the development, GPON has inherited BPON very many essential features, for example both all use the same OLT nucleus, the heart technology, and uses the similar physical optical fiber facility and the luminous power budget and so on. On the other hand, GPON has used some newest technology achievement, besides most