diversity and multiplexing switching 分集与复用切换
Integrated Switching And Multiplexing 集中转接和多路复用
multiplexing and switching 复用交叉连接
multiplexing and switching technique 复用和交换技术
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?
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