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小容量程控交换机,是指几十门以下或诸如一带四之类的交换机。这类交换瘆机,因其容量小,购买单位给予的安装环境,如电源、温度、湿度等相付大交换机来说较差,有的直接用市电供电,也没有接地线。因此,实际运行中,由于电源、温湿度等的影响,这类交换机要采取更加严格的抗干扰措施才能保证其正常工作,否则交换机工作中会出现乱振铃、串音、通话中断、登记数据丢失等不可靠现象。究其原因,排除软件设计的逻辑缺陷的因素,其他问题就来自各方面的干扰而造成程序跑飞和进入死循环等原因了。笔者多年来曾研制过多种类型和用途的小程控交换机,在抗干扰方面积累了一些经验,并且在87年就将看门狗电路应用在交换机中,现将一些心得提供给同行参考。
Small-capacity program-controlled switches, refers to dozens of the following or such as a band of four switches. Such exchange machine, because of its small capacity, the purchase of the installation given to the environment, such as power, temperature, humidity, etc. to deal with large switches is poor, and some directly with electricity supply, there is no ground wire. Therefore, in actual operation, due to the influence of power supply, temperature and humidity, etc., such switchboards should adopt more strict anti-jamming measures to ensure its normal operation, otherwise, the switch may be in working chaos ringing, crosstalk, call interruption, registration data Lost and other unreliable phenomenon. The reason, to exclude the logic of software design flaws, other issues come from all aspects of the interference caused by procedures such as running into the dead loop and other reasons. Over the years I have developed a variety of types and uses of small program-controlled switches, anti-jamming has accumulated some experience, and in the watchdog circuit in 87 years will be used in the switch, now some experience available to peer reference.