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文中针对Ｓ１２４０数字程控交换机与ＰＣＭ交流信令接口盘，在运用中出现的长途２４００ＨＺ入错号等故障，进行了分析，并提出了处理的方法。
In this paper, S1240 digital program-controlled switches and PCM AC signaling interface disk, the use of long-haul 2400HZ error number and other failures were analyzed and put forward the method of treatment.