公开(公告)号：US4679226A

公开(公告)日：1987-07-07

申请号：US745782

申请日：1985-06-17

申请人： Thomas C. Muehleisen

发明人： Thomas C. Muehleisen

IPC分类号： G06F21/00 ,  H04L12/22 ,  H04L29/06 ,  H04M11/06 ,  H04M11/00 ,  H04L9/00

CPC分类号： H04L63/10 ,  G06F21/313 ,  H04L12/22 ,  H04M11/06

摘要： A circuit (16) is designed to prevent unauthorized access to a remote device such as a computer (10) over a communications system such as a telephone network (12). A remote computer terminal (13) is connected to the telephone network (12) through a conventional modem (14). At the remote location of computer (10), circuit (16) is connected between computer (10) and another modem (15). Circuit (16) is also connected to the telephone network (12) to receive a signal therefrom which connects modem (15) through circuit (16) to computer (10) to temporarily access the same. The connection, however, is disconnected after a predetermined time period unless circuit (16) receives a second signal from the telephone network (12) before the expiration of that predetermined time period.

摘要翻译： 电路（16）被设计成防止通过诸如电话网络（12）的通信系统对诸如计算机（10）的远程设备的未经授权的访问。 远程计算机终端（13）通过常规调制解调器（14）连接到电话网络（12）。 在计算机（10）的远程位置，电路（16）连接在计算机（10）和另一个调制解调器（15）之间。 电路（16）也连接到电话网络（12）以从其接收信号，该信号通过电路（16）将调制解调器（15）连接到计算机（10）以临时访问该信号。 然而，连接在预定时间段之后被断开，除非电路（16）在该预定时间段期满之前从电话网络（12）接收到第二信号。