MAN must possess large capacity, high-bandwidth, multi-service and high reliability to achieve broadband IP service suppont capabilites on backbone layer.
城域网必须具备大容量、高带宽、多业务、高可靠性等能力，从而实现骨干层层面的宽带IP化业务支持能力。
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。
So the backbone layer, access layer and convergence layer are completely separated. the issue of efficiency of line slot utilization is resolved and data services is added.
彻底将骨干层、汇聚层、接入层分离。解决线路时隙利用率的问题，并加入了大量的数据业务。
MPLS, which stands for Multi-Protocol Label Switch, is the new generation standard for network layer routing on IP-based backbone network.
即多协议标记交换是新一代IP骨干网络的交换标准。
Finally, the design of MAC layer and the organization of Mobile Self-Organized Network which has three backbone nodes are introduced, and the measurement result is also presented.
最后介绍了MAC子层的设计和包含三个骨干网节点的移动自组织网络的构建，并给出了测试结果。
Mattress filled with high resilient polyurethane foam with a top layer of latex; follows the contours of your body and helps keep your backbone straight.
床垫装有高弹聚氨脂泡沫，表层为乳胶；贴身、柔软，而且，有助于使您的脊柱保持平直。
Mattress filled with high resilient polyurethane foam with a top layer of latex; follows the contours of your body and helps keep your backbone straight.
床垫装有高弹聚氨脂泡沫，表层为乳胶；贴身、柔软，而且，有助于使您的脊柱保持平直。
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