随着数字电视双向业务的推进，需要对接入网进行双向改造，应本着“光进铜退”的原则，光缆线路应一次规划，分步实施。接入网不仅要进行光缆改造，还要对同轴电缆网进行改造，既要充分利旧，又要兼顾未来发展，便于平滑升级，光缆线路要留有冗余，为光纤进一步向用户靠近、不断提高双向用户的入户带宽打下基础。%With the development of digital TV two-way business,it need to access network for two-way trans-formation,Should be based on the principle of “light into copper retreat”,Fiber optic cable line should be a plan,Step by step implementation.Access network is not only to carry out optical fiber cable,Also to the co-axial cable network to transform,Not only to make full use of the old,To take into account the future develop-ment,Easy to smooth upgrade,Fiber optic cable line to stay redundant,For the fiber further to the user,and continuously improve the home bandwidth of two-way users to lay the foundation.
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