What is the difference between optical cat and EPON
1. EPON and GPON adopt different standards. It can be said that GPON is a more advanced point, which can transmit larger bandwidth, and has more users than EPON 32313133353236313431303231363533e59b9ee7ad9431333365666331. GPON originated from the early APON\BPON technology of optical fiber communication, and developed from this, the ATM frame format is used to transmit the code stream.
The E of EPON refers to the interconnected Ethernet, so when EPON was born, it was required to be able to directly and seamlessly connect with the Internet, so the code stream of EPON follows the frame format of Ethernet. Of course, in order to adapt to the transmission on the optical fiber, a layer of EPON-defined frame format is wrapped outside the frame of the Ethernet frame format.
2. The EPON standard is IEEE's 802.3ah. The basic principle of the IEEE making the EPON standard is to carry out EPON standardization work within the 802.3 system structure as much as possible, and to minimize the expansion of the standard Ethernet MAC protocol.
3. The GPON standard is the ITU-TG.984 series of standards. The formulation of the GPON standard takes into account the support for traditional TDM services, and continues to adopt a 125ms fixed frame structure to maintain 8K timing. In order to support multiple protocols such as ATM, GPON has defined a new encapsulation structure GEM: GPONEncapsulaTIonMethod. You can mix and encapsulate data from ATM and other protocols into frames.
4. In terms of application, GPON has larger bandwidth than EPON. Its service carrying capacity is more efficient, and its optical splitting ability is stronger. It can transmit larger bandwidth services and achieve more user access. It pays more attention to multi-service and QoS guarantee, but it is more Complicated, this causes its cost to be higher than EPON, but with the large-scale deployment of GPON technology, the cost difference between GPON and EPON is gradually shrinking.
5. Comparison of GPON and EPON protocol stacks
To sum up, EPON and GPON have their own merits. GPON is superior to EPON in terms of performance indicators, but EPON has advantages in time and cost. GPON is catching up. Looking forward to the future broadband access market, it may not be who replaces who, but should be coexistence and complementarity. . For customers with high bandwidth, multi-service, QoS and security requirements, and ATM technology as the backbone network, GPON will be more suitable. As for customer groups that are cost-sensitive, QoS, and security are not high, EPON has become the dominant one.
