Combined with layer planning model, it also discusses the planning of backbone layer, distribution layer and leading-in layer of optical fiber access network in city.
结合光纤接入网分层规划模型模型，对城市光纤接入网的主干层、分配层和引入层的规划设计进行了探讨。
The optical fiber network is the backbone network of Heilongjiang electric telecommunication network, so its safe and stable operation is very important.
黑龙江电力光纤传输网是黑龙江电力通信网的主干网络，其安全稳定运行是电力通信网稳定运行的保证。
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