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。
One of the key techniques of N-ISDN is how to redesign and reform the existing stored program control exchangers.
实现N—ISDN的关键技术之一是对现有程控交换机的改造。
One of the key techniques of N-ISDN is how to redesign and reform the existing stored program control exchangers.
实现N—ISDN的关键技术之一是对现有程控交换机的改造。
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