| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve switching of a plurality of ports by a small time difference at a transmission side when planned interruptible switching is performed from an active communication path to a standby communication path in a transport network system.SOLUTION: At a time of switching from an active communication path RA to a standby communication path RB, a first node 110 switches an output destination of each port 112 from the active communication path RA to a transmission buffer 116 of the corresponding port, and a second node continues to transmit a back pressure signal to the first node 110 via the standby communication path RB for a time equal to or more than the maximum transmission delay difference between the active communication path RA and the standby communication path RB. Each output circuit 118 of the first node 110 sequentially outputs frames stored in the corresponding transmission buffer 116 to the standby communication path RB in response to completion of transmission of the back pressure signal by the second node.</p> |
