How to choose suitable technology for construction and transformation of access network

How to choose the applicable technology and technology in the construction and transformation of access network it is not simply a technical problem to consider a number of factors, such as competition, business load, self management (including operational support), historical assets, original technology system, personnel technology level and so on. At this stage, all kinds of technology have their own advantages, there are defects and deficiencies, there is no need to distinguish between pros and cons, regardless of the choice of technology, should strive to do well, and must first do a good job of the basic network, the network transformation continues to push forward. A number of operator representatives introduced their testing and application of EOC, the common conclusion is: At present, EOC has been able to support the current business applications, after a period of time operation is more stable than the CMTS system environment adaptability. At the same time, it also points out that the EOC needs to be improved and perfected in the aspects of unified network management, interconnection and multi service support, and standardization is needed. On the choice of specific technical options, most experts recommend: 1, the priority to achieve FTTB, there is demand, the conditions of the Villa area using FTTH mode. FTTH is a commanding point of access network, with the continuous reduction of PON equipment and FTTH overall technology maturity, telecommunications operators have begun to deploy the scale, the grid also through the fiber composite low-voltage cable (OPLC) Everywhere pilot FTTH. The cable network operators must have a sober understanding and appropriate countermeasures to face this form. The most suitable deployment of FTTH is the Villa area: On the one hand, the Villa area user consumption capacity is high, for a variety of high bandwidth applications (video communication classes) have practical needs; On the other hand, the total cost of FTTH access in Villa area (construction cost and life cycle total operational cost) is no higher Therefore the cable operator should take the Villa area as FTTH cut-in point. However, it is neither realistic nor necessary to introduce FTTH to the wired network at present: The universal bandwidth demand is not so high; the cost of transformation is not enough; in the competitive environment, it is impossible for cable to occupy a large share in FTTH; The coaxial resource is enough to contend for FTTH for a long time. 2, has been deployed to the scale of the CMTS place, continue to use DOCSIS technology, as soon as possible to expand coverage and improve permeability, especially to improve the built-in cm set-top box ratio. The cost of a built-in cm is lower than the built-in EOC for the current and future periods. This is advantageous for rapid deployment operations, especially the High-definition interaction based on set-top boxes and user data mining. This can also be diluted early CMTS investment. At the same time, attention to follow-up evolution, there are two main routes: first, on the basis of the evolution of DOCSIS, the possible options are DOCSIS PON, epon+docsis EoC; second, in the expansion of the set-top box infiltration, the pilot EPON+EOC coexist with the DOCSIS, once there is a large bandwidth demand, You can deploy EPON+EOC. As soon as possible to improve China's docsis standards, especially supporting the design, engineering, acceptance, maintenance management norms. 3. EPON+EOC or Epon+lan models have not yet been deployed or where CMTS have been deployed but unsuccessful.Although CMTs is a very sophisticated device, unit bandwidth costs are higher than other access modes, even higher than FTTH. Operational costs and technical requirements are also relatively high. Therefore, NGB-oriented high-bandwidth access networks are not suitable for use in places where there is no deployment of CMTS or are deployed but unsuccessful (equal to no deployment). 4, has achieved FTTB, and the early stage of a large number of laying five types of lines where the use of Epon+lan mode. At this stage, 100% two-way and conditional laying of five types of lines are preferred to adopt Epon+lan mode. The rest adopts EPON+EOC mode. Because the LAN method is also mature technology, relatively simple, so stable, each user's exclusive bandwidth is high, compared with other access mode in the case of high permeability and cost advantage, but also with the telecom has a competitive access mode. Therefore, the above premise should be selected first. Using Epon+lan mode for bidirectional transformation, to solve the problem of wiring and lightning protection, we should plan the terminal access and indoor connection mode of five kinds of line, and solve the problem of long-term maintenance management. 5, has achieved FTTB local priority to choose high-frequency modulation scheme. The other uses low-frequency modulation scheme. The advantage of high frequency modulation scheme is: The spectrum resource is rich, the expansibility is good, the spectrum is clean, the interference is small. After realizing the FTTB, the link loss is no problem, so it is reasonable to adopt the High-frequency modulation scheme under this premise. The high frequency modulation scheme should pay special attention to the quality of the branch distributor and the indoor wiring of the users, so as to prevent the link loss caused by these two problems too large. High-frequency modulation in the HINOC is not commercially available prior to the use of reduced-frequency WiFi (802.11n) scheme, the first low-cost implementation of two-way and set-top box interaction. Because this scheme can be implemented in a variety of ways to achieve a set-top box two-way: Built-in module, USB interface, RS232 interface, the lowest cost, can do below 50 yuan. According to the calculation, the use of P1901 and WiFi dual-mode, 25%p1901 terminal and 100% set-top box two-way, more than the 100%p1901 Terminal access network to transform the overall cost can be reduced by half. This scheme has a single channel (one low) and two modular terminals that can achieve 400M throughput. In fact, as long as the set-top box and other appliances are integrated with standard WiFi (which is easy to implement, many devices are available), the addition of a frequency reduction module is easier to implement, with lower costs and more flexible applications. At present, the economic conditions are relatively good, the business requirements of higher places can also choose MoCA1.1, 2.0 (Unfavorable Choice 1.0). After Hinoc mature commercial, WiFi can still be used as a set-top box two-way solution. 6, low frequency modulation of the current priority to choose compatible P1901 HomePlug technology, in the successful application of HPNA technology can also continue to deploy the modulation in more than 20MHz HPNA equipment. Comprehensive comparison, P1901 physical layer is better than HPNA,MAC layer than HPNA. But the physical layer determines modulation efficiency and robustness, and P1901 the current rate level is temporarily ahead. Therefore, the priority is to choose P1901. HPNA anti-jamming performance is poor, but to avoid interference is a feasible measure, so have been used to continue to use well. P1901 should be further simplified and optimized to fit the coaxial application environment, enhance multicast support and reduce time delay. At this stage, P1901 chips and equipment to achieve interoperability under the leadership of operators. There are some experts and representatives that should be based on different circumstances to choose the appropriate technology, let the market decide, the fittest. EOC Low Frequency scheme standard this part of the discussion is more decentralized: Some experts suggest that the unified MAC layer, consistent with the PON to ensure business interoperability; Some experts believe that the physical layer and the MAC layer is closely related to the MAC layer must adapt to the physical layer; Some experts recommend improvements to the MAC layer of P1901 To adapt to the coaxial application environment; Some experts suggest that we should take into account the long-term development at the same time to reflect the advanced nature of independent innovation, physical layer to adopt more advanced coding modulation scheme. Some experts believe that considering the compatibility of the physical layer should not be changed. How to choose the suitable technology for the construction and transformation of access network It's over, I hope we've got some gains.