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CCITT建议的No.7公共信道信令系统(CCSS),由于它的高效率、灵活性和多用性,已广泛地用于数字电话交换网和即将到来的综合业务数字网(ISDN)中。本文讨论了No.7信令系统的测试,并对我们所开发的No.7信令系统第二功能级测试器的设计原理及其实现作了详细的介绍。
CCITT’s proposed No.7 Common Channel Signaling System (CCSS) is widely used in digital telephone switching networks and the upcoming Integrated Services Digital Network (ISDN) for its high efficiency, flexibility and versatility. This article discusses the testing of No.7 signaling system and gives a detailed introduction to the design principle and implementation of the second functional level tester of No.7 signaling system that we have developed.