This paper analyses the basic character of layer 3 switching technologies and parses the sort, the theory of working and the way of configuring VLAN with it.

分析了第三层交换技术基本特征，解析了三层交换技术分类、工作原理及实现配置VLAN的方法。

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But old style phone regulations often require network operators to maintain and expand obsolete copper wires and TDM (time division multiplexing) switching technologies.

FORBES: "Phone" Is Just an App; Why Regulate It?

Roth counters that the deal catapults Nortel ahead of its chief competitors -- number one phone equipment maker Lucent Technologies, and Cisco Systems, the largest Internet switching gear manufacturer.

FORBES: Follow Through