...信网；接入网；自愈环；通道保护环；自动倒换次数 [gap=775]Key words optical fiber communication networks; access networks; self-healing ring; path protection; number of automatic switching times ..
The concept of accessnetworks is evolved with the immigration of subscriber networks, and becomes a hot point in current telecom industry.
接入网是在电信网络的用户网在演变过程中引出的概念，是目前电信界最热门话题之一。
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The fourth generation of the mobile communication systems are characterized by the heterogeneous accessnetworks and IP-based transport technologies.
第四代移动通讯系统的特点是：多种接入网络和基于IP的传输技术。
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Tunable Laser is an ideal optical source in WDM optical networks. It is important components in optical Packet Switching and it is also used in router of accessnetworks.