With the rapid development of the Internet, the demand for network bandwidth by network users is increasing. In order to meet the needs of the market, the backbone of the communication network has undergone tremendous changes, and the traditional access network, which has been changing little, has become a bottleneck in the entire network, and various new broadband access technologies have become research hotspots.

EPON (Ethernet Passive Optical Network) is a new type of fiber access network technology that uses point-to-multipoint architecture, passive optical fiber transmission, and provides multiple services over Ethernet. It uses PON technology in the physical layer, Ethernet protocol in the link layer, and Ethernet access using the PON topology. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost; high bandwidth; strong scalability, flexible and fast service reorganization; compatibility with existing Ethernet; convenient management and so on.

Due to the many advantages of EPON, it is increasingly favored by people and will soon become the most effective communication method for broadband access networks. In order to ensure stable, efficient and accurate operation of the EPON network, it is especially important to provide an effective network management system for EPON.

In the field of network management, with the continuous development of network management technology based on TCP/IP system, SNMP has become the de facto standard. The SNMP-based EPON network management system refers to a system that implements effective management of resources of an EPON network entity by using an SNMP management protocol framework.

In November 2000, the IEEE established the 802.3 EFM (Ethernet in the First Mile) research group. 21 network equipment manufacturers in the industry initiated the establishment of EFMA to realize the Gb/s Ethernet point-to-multipoint optical transmission solution, so it is also called GEPON (GigabitEthernet PON). EFM standard IEEE802.3ah;

EPON is an emerging broadband access technology that integrates data, voice and video services through a single fiber access system and is economical. The industry generally believes that FTTH is the ultimate solution for broadband access, and EPON will also become a mainstream broadband access technology. Due to the characteristics of the EPON network structure, the special advantages of broadband access and the natural integration with the computer network, experts all over the world agree that the passive optical network is to achieve "three networks in one" and solve the information highway. The best transmission medium for the “last mile”.

The EPON access system has the following features:

1. There is only optical passive components such as optical fiber and optical splitter between the central office (OLT) and the user (ONU). There is no need to rent a computer room, no power supply, and no active equipment maintenance personnel. Therefore, construction and Operation and maintenance costs;

2. EPON adopts Ethernet transmission format and is also the mainstream technology of user LAN/resident network. The two have natural integration, which eliminates the cost factors brought by complex transmission protocol conversion;

3. Using single fiber wavelength division multiplexing technology (downstream 1490nm, uplink 1310nm), only one backbone fiber and one OLT are needed, and the transmission distance can reach 20 kilometers. It is distributed to the maximum of 32 users through the optical splitter on the ONU side, thus greatly reducing the cost pressure of the OLT and the backbone fiber;

4. The uplink and downlink are both Gigabit rates. The downlink uses the encrypted broadcast transmission for different users to share the bandwidth, and the uplink uses Time Division Multiplexing (TDMA) to share the bandwidth. High-speed broadband, fully meet the bandwidth requirements of access network customers, and can dynamically and flexibly allocate bandwidth according to changes in user requirements;

5. Point-to-multipoint structure, only need to increase the number of ONUs and a small number of user-side fibers to easily expand and upgrade the system, fully protecting the operator‘s investment;

6. EPON has the ability to transmit TDM, IP data and video broadcast at the same time. TDM and IP data are transmitted in IEEE 802.3 Ethernet format, supplemented by carrier-class network management system, which is enough to ensure transmission quality. Video service broadcast transmission can be realized by extending the third wavelength (usually 1550 nm).

7. EPON can provide 1.25Gb/s bandwidth for uplink and downlink symmetry, and can be upgraded to 10Gb/s with the development of Ethernet technology. ZTE released the world‘s first one at the 2009 China FTTH Summit Development Forum held in Beijing. "Symmetric" 10G EPON equipment prototype.