公开(公告)号：US06381477B1

公开(公告)日：2002-04-30

申请号：US09434750

申请日：1999-11-05

申请人： Robert M. Johnson, Jr. ,  Peter McMahan

发明人： Robert M. Johnson, Jr. ,  Peter McMahan

IPC分类号： H04B138

CPC分类号： H04B1/3888 ,  H02J7/0027 ,  H04B1/3816 ,  H04B1/3883

摘要： A method for protecting a circuit module in a communication device includes first detecting whether a circuit module is present in the communication device. A next step includes measuring a supply voltage to the communication device. A next step includes comparing the supply voltage to a predetermined threshold voltage. When the supply voltage is below the threshold, a next step includes supplying normal functionality to the phone and returning to the comparing step. However, when the supply voltage is above the threshold, a next step includes powering down a connection to the SIM card to limit functionality of the communication device.

摘要翻译： 一种用于保护通信设备中的电路模块的方法包括首先检测电路模块是否存在于通信设备中。 下一步包括测量通信设备的电源电压。 下一步包括将电源电压与预定阈值电压进行比较。 当电源电压低于阈值时，下一步骤包括向电话提供正常功能并返回到比较步骤。 然而，当电源电压高于阈值时，下一步骤包括断开与SIM卡的连接以限制通信设备的功能。