ring-down trunk

Analysis on the Relevance between Populus's Trunk Annual Ring and Their First Branch Annual Ring

胡杨主干与一级枝年轮宽度相关性分析

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Trunk line in ring configuration appropriate valves, cut off for inspection purposes.

且在环状主干线上配置适当之阀门, 以便检修切断之用.

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This paper introduces the general situation of construction of State Power Beijing broadband data MAN, and the IP ring networks, MPLS VPN technology which used in MAN, it also introduces the main technology characteristics of data network, including trunk network and construction of connect layer.

介绍了国电北京宽带数据城域网的建设概况以及其中使用到的IP环网技术、MPLS VPN技术，并详细介绍了该数据网的主要技术特点，包括骨干网建设、接入层建设等。

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