EPON + EoC is the best way for radio and television access network technology
The two-way transformation of China's radio and television is currently undergoing exploration of a variety of technologies, including CMTS (Cable Modem Termination System), PON + EoC, PON + LAN and even pure PON FTTH.
CMTS technology is mature but the bandwidth cost is high; EPON + LAN faces many problems such as the difficulty of reconstruction of the entire network, the high coverage cost at low access rates, and the management of corridor switches; EPON + EoC is characterized by the difficulty and speed of the entire network transformation. At the same time, the cost per household is low; however, EoC also has the problem of numerous technologies and the lack of a unified standard.
In terms of EoC technology selection, there are currently passive WOC schemes, high-frequency and low-frequency MOCA schemes. Despite its low cost, passive EOC has limited application scenarios due to the inability to penetrate the branch distributor, and needs to be aware of its manageability issues. The high-frequency EoC technology is limited by large attenuation, and has high requirements on the quality of the coaxial cable, and its application is not very extensive. Among them, the bandwidth of WOC is low, and the rate of multiple users drops rapidly. Although the bandwidth of MOCA is high, its cost is currently high, and its promotion is not optimistic. In low-frequency technology, HomePNA has poor anti-interference performance, and not many are used. At present, HomePlug AV / BPL technology is widely used, and P1901 is the trend of choice in most regions. For comprehensive consideration, it is recommended to use HomePlug AV technology, and it can be smoothly upgraded to IEEE P1901 up to ITU-T G.hn standard.
Compared with CMTS and EPON + LAN, EPON + EoC (EoC takes HomePlug AV as an example) has certain advantages in terms of bandwidth to home and average cost per household. Especially in terms of coverage cost, CMTS households need a coverage cost of 911 yuan for 30% access rate of 2M access bandwidth, 128 yuan for EPON + LAN, and 54 yuan for EPON + EoC; 1M access bandwidth with 10% access rate In the case of CMTS, the average cost per household needs 161 yuan, EPON + LAN costs 128 yuan, and EPON + EoC costs only 29 yuan.
"The investment in the construction of the access network is mainly in the construction and transformation of the line. Whether it is possible to achieve low-cost coverage and simultaneously develop business quickly is the key. The radio and television has the world's largest coaxial cable access network, and the number of users actually covered More than 300 million households have opened 174 million households with a physical spectrum bandwidth of 900MHz to 1.5GHz. Hu Baomin, product director of Wuhan Changguang Technology Co., Ltd., pointed out at the CCBN2010 Digital Technology Future Forum (Cable Network Bidirectional Transformation Sub-Forum) that By comprehensively comparing various technical solutions, the bidirectional network transformation combining EPON and EOC is relatively more advantageous.
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