| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem, wherein heretofore if a MAC address of a legal home gateway device is permitted and the device is then replaced by an unauthorized terminal under an assumed permitted MAC address, access to a terminal side is made possible by the unauthorized terminal. <P>SOLUTION: The present invention relates to an access system comprising a supervisory and control server which monitors the link state of a network access system under management and performs link-down control; a line terminating device which detects link-down of a port, connected to a low-order device and notifies the supervisory and control server regarding link-down; and a home gateway device that is connected to the line terminating device directly or via a hub, wherein the supervisory and control server gives a link-down instruction to the home gateway device at predetermined time intervals. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
