论文部分内容阅读
电话机摘机后拨号仍能听到拨号音,我们称之为拨号音切不断。产生拨号音切不断的原因是多方面的,下面就此故障产生的原因进行分析。一、发号制式不正确1.随着通信事业的迅猛发展,局用交换机普遍程控化,许多程控交换机开通了双音频拨号(即 DTMF拨号),当用户电话机不具备双音拨号功能时,发号时的断续脉冲被交换机拒绝接收,所以交换机仍送拨号音。对于这种电话机只有对其拨号电路进行改制后才能适用,改制方法可参考笔者发表在《电子产品维修与制作1995年10、11期》、《现代通信1995年12期》等文章。
After the phone picks up the dial can still hear the dial tone, we call the dial tone cut continuously. There are many reasons for the constant tone dialing, and the reasons for the failure are analyzed below. First, the numbering system is not correct 1. With the rapid development of communications, the Bureau of general program-controlled switches, many program-controlled switches opened dual-tone dialing (DTMF dialing), when the user does not have dual-dial telephone dialing function, Intermittent pulse when the number was refused by the switch to receive, so the switch is still sending dial tone. For this phone only after the dial-up circuit can be adapted to the restructuring method can refer to the author published in “Electronic Products Maintenance and Production in 1995 10, 11”, “Modern Communications 1995 12” and other articles.