| 摘要 |
A network system which has an exact measure for solving a defect and therefore is very reliable and a method for setting a path thereof. With a plurality of node devices, each of which has a local communication device that is a source of data, an ATM-method loop-type network is built. In the case that a local communication device (21-1) and a local communication device (21-2) transmit data interactively, a communication path (41) for transmitting data and a communication path (42) for receiving data are formed by separate paths at both sides of a loop, and a spare communication path (43) is formed in the reverse direction. When any defect occurs on the transmission path, a loopback is conducted between the node devices which are adjacent to the defective point using the spare communication path to recover the communication path. |
