| 摘要 |
<p>An optical-fiber ring network is capable of operating in the face of the failure of any single node regardless of the particular node failure mechanism, including stuck "on" and stuck "off" transmitters. Each node in the network (302) comprises a main receiver (312), an alternate receiver (322), and a transmitter (332). The main receiver (312) receives data from the immediately adjacent upstream node (301), while the alternate receiver (322) monitors transmissions from the next preceding upstream node. Each node diagnoses the transmitter in its immediately adjacent upstream neighbour and its own main receiver. If either fails, the node switches from its main receiver to its alternate receiver to bypass the immediately adjacent upstream node, while the rest of the ring remains functional.</p> |
