Introduction for EPON and 10G-EPON
Compared with GPON network and 10G-GPON, it seems that EPON and 10G-EPON is less known, thisarticle will mainly introduce EPON & 10G-EPON, and difference between GPON and EPON.
What is EPON?
EPON (Ethernet Passive Optical Network), is a PON technology based on Ethernet. It adopts point-to-multi-point structure, passive optical fiber transmission, and provides multiple services on Ethernet.
A single optical fiber with two wavelengths is used in EPON network to transmit bidirectional1.25Gbit/s digital signals. 1310nm at upstream direction, downstream 1490nm. EPON network iscomposed of OLT (Optical Line Terminal), ONU (Optical Network Unit) and ODN (Optical DistributionNetwork). The physical topology is a point-to-multipoint tree network, and the logical topology ismultiple point-to-point links from the OLT to each ONU. Among them, ODN plays the role ofconnecting OLT and ONU.
As one of the PON technologies, EPON has common features such as high bandwidth, long-distancecoverage, flexible networking, and passive intermediate network nodes. Applying to broadband accessnetworks, it can improve network bandwidth and performance and reduce maintenance costs. It is anoptical access technology favored by mainstream operators. EPON can be used in FTTH, FTTB, FTTOand FTTM environments to provide Voice, data and video service.
PON working principle
EPON downstream communication principle
EPON adopts broadcast mode in the downstream direction. All ONUs can receive the same data.Different ONU data is distinguished through LLID (Logical Link Identifier), and ONUs filter broadcastmessages to receive their own data.
EPON upstream communication principle
In the upstream direction from ONU to OLT, time division multiple access technology (TDMA) isapplied to transmit upstream traffic in time slots.
What is 10G-EPON?
10G-EPON is an enhanced next-generation EPON technology based on the existing EPON technicalstandards. It mainly solves the following problems of EPON networks:
The continuous development of high-bandwidth business types has higher requirements forbandwidth, and EPON technology cannot provide enough bandwidth to meet the demand.
User-side access technologies continue to innovate, and user access bandwidth continues toincrease. EPON technology will become a bandwidth bottleneck.
Splitting ratio and transmission distance directly affect network construction investment.
Symmetric 10G-EPON
Symmetric-rate 10G-EPON supports both transmit and receive data paths operating at 10 Gbit/s.
Asymmetric 10-EPON
Asymmetric upstream transmission is 1G-EPON, downstream transmission at 10 Gbit/s.
10G-EPON downstream communication principle
In the downstream direction, OLT sends data to ONU via broadcast, all ONUs can receive same data,and the ONU will judge whether to receive the data based on the LLID information.
10G-EPON upstream communication principle
In the upstream direction, time division multiple access technology (TDMA) is used to transmitupstream traffic in time slots, and the ONU performs data upstream transmission according to the timeslots allocated by the OLT.
EPON to 10G EPON evolution
With the development and popularization of high-speed broadband services such as high-definition television, video communications, video surveillance, online games, Internet access, and VoIP, access bandwidth is facing huge challenges. EPON network only provides 1.25G rate, which cannot meet bandwidth demands of people, 10G-EPON comes into being. 10G EPON is compatible with the 1G EPON. 10G EPON and 1G EPON can coexist by sharing same ODN, OLT and PON port.
Above is only basic and brief description about EPON and 10G-EPON, some EPON key Technology like DBA FEC and EPON Standards & protocols are not mentioned in this article, if you want to know more, you can contact www.htfwdm.com support team.
