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    • 10. 发明授权
    • Office-line trunk circuit operating on ground-start and loop-start modes, method of controlling same, and control program for same
    • 办公线路干线电路工作在接地启动和回路启动模式,控制方法和控制程序相同
    • US07539299B2
    • 2009-05-26
    • US10926363
    • 2004-08-26
    • Kazuo Kanayama
    • Kazuo Kanayama
    • H04M1/00H04M9/00H04M9/08
    • H04Q3/62H04M7/0096H04Q2213/1308H04Q2213/1322H04Q2213/1338
    • An office-line trunk circuit is provided to selectively operate on ground-start and loop-start modes. In this circuit, a DC current detection circuit has (i) a first photo coupler detecting a DC loop current caused responsively to supply of the ground to a tip line and a negative power to a ring line from an office bilateral trunk and (ii) a resistor whose resistance is adjusted to prevent a loop start in the office bilateral trunk and allow DC current to be detected. The first photo coupler detects the loop current using the resistor. An incoming detection circuit has a second photo coupler detecting a ring signal coming from the office bilateral trunk. A DC sink circuit has a diode bridge placed between the tip and ring lines and configured to have a DC circuit provided with a transistor controlling the DC loop current so that the office bilateral trunk is allowed to selectively be loop-activated and loop-held.
    • 提供一个办公室中继电路,以选择性地在接地启动和回路启动模式下工作。 在该电路中,DC电流检测电路具有:(i)第一光电耦合器,检测响应于地面向尖端线路供电的DC环路电流和从办公室双向干线向环形线路发出的负电力,以及(ii) 电阻器的电阻被调整以防止在办公室双向干线中的环路启动并允许检测直流电流。 第一个光耦合器使用电阻检测回路电流。 输入检测电路具有检测来自办公室双向干线的振铃信号的第二光耦合器。 DC吸收电路具有设置在尖端和环形线之间的二极管桥,并且被配置为具有设置有控制DC环路电流的晶体管的DC电路,使得允许办公室双向主干被选择性地环路激活和循环保持。