They invented the stored program control switch in the 1970s, as a move toward cost reduction and reliability.
1970年代他们发明了程控交换机，保证了可靠性，降低了成本。
The most attractive thing is that the Digital Program Control Switch System is widely applied, which is the foundation of the digitalization for the whole network.
其中最引人注目的就是广泛采用了程控数字交换机，为全网的数字化奠定了基础。
The most attractive thing is that the Digital Program Control Switch System is widely applied, which is the foundation of the digitalization for the whole network.
其中最引人注目的就是广泛采用了程控数字交换机，为全网的数字化奠定了基础。
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