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本文从ISDN的概念出发，研究了世界各国通信网向ISDN过渡的技术策略，从而提出黑龙江省发展ISDN的技术策略、资费策略、终端设备产业的策略及建设方案。
Based on the concept of ISDN, this paper studies the technical strategy of the transition from ISDN to ISDN in all countries in the world, and proposes the strategy and strategy for developing ISDN in Heilongjiang Province. The strategy and construction scheme of terminal equipment industry are proposed.