| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide means and a method for capable of switching path even if a fault has occurred in an access accommodation node, and restoring communication between a relay network and a user terminal. <P>SOLUTION: An access accommodation node 201 comprises: two upper-level ring ports 302 which are interfaces with two adjacent nodes included in an upper-level ring 250; an access accommodation port 303 connected to a user terminal 203 via an access section 204; and a port control circuit 350 which blocks the access accommodation port 303 when it has detected a fault of the upper-ring 250 from the two upper-level ring ports 302, and allows passage of the access accommodation port 303 when it has received a fault notification message notifying the detected fault of the upper-level ring 250 and a relay node 202 having given the fault notification message and a preset relay node 202 have matched with each other. <P>COPYRIGHT: (C)2013,JPO&INPIT |
