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本文叙述S1240数字程控电话交换机专用的双交换端口（DUSP）的结构与功能。采用D／E型MOS制造技术。电路典型工作频率为4MHz，功耗为750mW，并通过比利时贝尔电话公司质量认证考核。
This article describes the S1240 digital program-controlled telephone exchange dedicated double-port (DUSP) structure and function. D / E-type MOS manufacturing technology. Typical circuit operating frequency of 4MHz, power consumption of 750mW, and through the Belgian Bell Telephone Company Quality Certification assessment.