The Gigabit Ethernet Passive Optical Network (GPON) was first proposed by the FSAN organization in September 2002. On this basis, ITU-T completed the development of ITU-T G.984.1 and G.984.2 in March 2003, 2004. The standardization of G.984.3 was completed in February and June. Thus, the standard family of G-PON is finally formed.
A. GPON can provide downlink rates of 1.244Gbit/s and 2.488Gbit/s and multiple standard upload rates specified by the ITU, which provides flexibility to provide symmetric and asymmetric rates. The transmission distance is at least 20km, and the system split ratio can be 1:16, 1:32, 1:64 or even 1:128;
B.GPON adopts two adaptation methods. In addition to the traditional ATM, a new SDH-based standard universal framing program (GFP) is used in the transmission aggregation layer. This is a transparent and efficient method. The data signal is encapsulated into the existing standard SD signal mapping technology of the existing SDH network, and can adapt to any user signal format and any transmission network standard, without adding an ATM or IP encapsulation layer, and has high packaging efficiency and flexible service.
C. Since G-PON adopts GFP mapping, its transmission aggregation layer is synchronous in nature, and uses standard SDH 125μs frame, so that GPON can support end-to-end timing and other quasi-synchronous services, especially direct high quality and flexible support. Real-time TDM voice service, delay and jitter performance is very good.
D.GPON has rich functions in network management, including bandwidth authorization allocation, dynamic bandwidth allocation, link monitoring, protection switching, key exchange and various alarm functions. It is more thoughtful than EPON.
E. In terms of quality of servise(QoS), GPON can adjust the ONU's authorized bandwidth and authorization period by using pointers to ensure the bandwidth and delay requirements of the service.
