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某些城市在引进长途程控交换设备时遇到原有F式步进制交换机与程控交换机的配合问题。因为F式交换机与47式交换机不同,它在被叫到达及应答时无a、b线反极性能,长途自动计费有困难。有的地方采用修改终接器电路的办法来解决,但这种方法有一定的缺点,原因是一般F式设备机器均很陈旧,往往已使用四五十年,机架布线稍一接触就断线,施工难度较大,且往往修改电路后性能不一定满意。故我们提出一个解决方案,即在F式机房内新加装一套长途呼入系统。这一套长途呼入系统采用JZB—1A型设备,具体方法是程控长市
Some cities in the introduction of long-distance program-controlled switching equipment encounter the original F-type step switch and program-controlled switches with the problem. Because F-type switch and 47-switch, it is called when the arrival and response without a, b line reverse polarity, long-distance automatic billing difficulties. There are some ways to solve the circuit by modifying the terminator, but this method has some drawbacks, because the general F-type equipment are very old machines, often four or five years have been used, the rack wiring touch a little off Line, construction more difficult, and often not satisfied with the performance of the circuit after modification. Therefore, we propose a solution that a new long-distance call-in system is installed in the F-type computer room. This set of long-distance calling system uses JZB-1A-type device, the specific method is to control the long market