Optical path fault management in layered networks

Abstract

A fault management technique for the optical path network employing WDM is proposed. Fault management is divided into optical path fault management and equipment fault management. The former always monitors the optical path and guarantees optical path !zansp~rt performance through the network. The latter starts isolating the failed optical module after detecting the optical path failure. For robust optical path fault management, the bit mor rate @ER) of the optical signal should be monitored. Realized by the bit interleaved parity technique, this can create effective fault management.

Link Scanner: Faulty link detection for wireless sensor networks

“…We consider this problem in a large-scale wireless sensor network, and the network topology is known [6], [23], [4], [19]. A link exists if it's length is within the communication range of radio.…”

“…[7] develops a non-adaptive fault diagnosis through a set of probes where all the probes are employed in advance. The authors in [6] propose a failure detection scheme, in which monitors are assigned to each optical multiplexing and transmission section. These approaches usually compute the probe paths according to different network symptoms, so as to combine the network topology to infer the link status.…”

Monitoring Trail: On Fast Link Failure Localization in All-Optical WDM Mesh Networks

“…Without loss of generality, we call the device that monitors the health of a certain part of the network as a monitor [1][2][4][5][6][7][8][9]. Such a monitor is also responsible for generating alarm if a failure is detected.…”

Monitoring cycles for fault detection in meshed all-optical networks

“…Applying the smallest numbered node first rule, we select link (1,2) . After a DFS iteration the cycle 1-2-3-7-4-1 is obtained and added to C. Nodes in set {1,2,3,7,4} and links in set { (1,2), (2,3), (3,7), (7,4), (4,1)} are labeled as "covered".…”

“…Reference [3] developed a fault detection scheme by assigning monitors to the sinks of each optical multiplex section and optical transmission section. A heuristic algorithm was proposed in [4] to efficiently assign monitors and thus reduce the required number of monitors.…”