今年春上,一位同志买了一台松下3861自动电话机。他在商店当场试机很好用,可是,拿回家安装后电话却打不出去。次日,他拿去要求商店退货,商店营业员告诉他,回家后用手指扳动一下电话机上的“脉冲/音频”按键即可,回家电话果然便畅通了。 小小一只开关为啥能控制电话通断?这得从自动电话家族谈起。自动电话家族,目前是“两代同堂”:单机有拨号盘式和按键式两种;电话总机有程控式和非程控式两类。拨号盘负责发送拨号脉冲,由于是靠机械施转,不仅容易出故障,而且发号速度慢,尤其是拨8、9、0等高位号码时,更费时间,影响了电话交换机的有效利用率。60年代初期,出现了按键电话机,它用按键代替拨号,根据所要电话号码分别按 This spring, a comrade bought a Panasonic 3861 automatic telephone. His test machine in the store on the spot very easy to use, but after taking home to install the phone can not beat out. The next day, he took to ask the store to return, the store clerk told him to go home and turn your finger on the “pulse / audio” button on the phone can be, then the home phone really clear. Why can a small switch control the phone off? This talk from the automatic phone family. Automatic phone family, is currently “two generations of the same”: stand-alone dial-type and button type two; telephone switchboard with program-controlled and non-programmed two categories. Dial is responsible for sending dial pulse, because it is relying on mechanical rotation, not only prone to failure, and send numbers slow, especially dialing 8,9,0 and other high numbers, the more time-consuming, affecting the effective utilization of telephone exchange . The early 60s, there have been key phones, which use the keys instead of dialing, according to the phone number was pressed