What is the difference between GPON and EPON?

Both are in the form of optical fiber transmission, but there are the following differences between them:

1, EPON and GPON adopt different standards. It can be said that GPON is more advanced than EPON, which can transmit more bandwidth and bring more users. ? GPON originated from the early optical fiber communication APON\BPON technology and developed on this basis. ATM frame format is used to transmit code streams. The E of EPON refers to the Internet, so the birth of EPON has the requirement of direct and seamless connection with the Internet, so the code stream of EPON adopts the Ethernet frame format. Of course, in order to adapt to the transmission on optical fiber, a frame format defined by EPON is wrapped outside the frame format of Ethernet.

2. The standard of EPON is IEEE's 802.3ah The basic principle for IEEE to formulate EPON standard is to standardize EPON within the 802.3 framework as much as possible, and to minimize the MAC protocol of standard Ethernet. ?

3.GPON standard is ITU-TG.984 series standard. The GPON standard has taken into account the support for traditional TDM services, and continues to adopt the fixed frame structure of 125ms to maintain the continuity of 8K timing. In order to support ATM and other multi-protocols, GPON defines a brand-new encapsulation structure GEM: GPON encapsulation method. Data of ATM and other protocols can be mixed and encapsulated into frames. ?