Abstract: A method for selecting routing paths of data packets in a data network including plural communication links and routing apparatuses. The method includes: calculating and assigning to the communication links respective communication links' costs; calculating, for at least two different routing paths, respective routing path overall costs, which depend on the communication links' costs assigned to communication links making up such routing path; selecting, among the at least two different routing paths, the routing path having the lower routing path overall cost; causing a new data packet to be routed in the data network over the selected routing path, and collecting measures indicative of at least one performance parameter indicating a performance of previous transmissions of data packets from origin end points of the data network to destination end points of the data network, and using the collected measures for calculating the communication links' costs.

Abstract: A method for selecting routing paths of data packets in a data network including plural communication links and routing apparatuses. The method includes: calculating and assigning to the communication links respective communication links' costs; calculating, for at least two different routing paths, respective routing path overall costs, which depend on the communication links' costs assigned to communication links making up such routing path; selecting, among the at least two different routing paths, the routing path having the lower routing path overall cost; causing a new data packet to be routed in the data network over the selected routing path, and collecting measures indicative of at least one performance parameter indicating a performance of previous transmissions of data packets from origin end points of the data network to destination end points of the data network, and using the collected measures for calculating the communication links' costs.

Abstract: In order to locate malfunction in a communication network, the elements therein are configured for generating alarm and to propagate a malfunction signalling to at least one other element in said set. Those elements in the network to which the malfunction signalling was propagated, are excluded, preferably by way of self-exclusion, from the action of locating malfunction. Preferably the arrangement is implemented in the form of a distributed agent-based architecture, wherein each element has an associated agent for categorizing the alarm information in its possession, e.g., as related to internal malfunction, contiguous malfunction, and external malfunction. The categorized alarm information is collected, preferably via direct exchange between the associated agents, for all the elements having alarmed resources physically or logically connected with each other.

Abstract: A method for locating a fault in a communication network, includes receiving status information relating to alarms, events, polled statuses or test results in the communication network; and locating the fault based on the received status information, wherein locating the fault includes identifying a limited region of the communication network in which the fault has occurred based on the received status information and on topological and functional information relating to network apparatuses that have generated the status information; constructing a probabilistic model relating faults and status information in the identified limited region of the communication network; and locating the fault based on the constructed probabilistic model and on status information received from the identified limited region of the communication network.

Abstract: A method for locating a fault in a communication network, includes receiving status information relating to alarms, events, polled statuses or test results in the communication network; and locating the fault based on the received status information, wherein locating the fault includes identifying a limited region of the communication network in which the fault has occurred based on the received status information and on topological and functional information relating to network apparatuses that have generated the status information; constructing a probabilistic model relating faults and status information in the identified limited region of the communication network; and locating the fault based on the constructed probabilistic model and on status information received from the identified limited region of the communication network.

Abstract: In order to locate malfunction in a communication network, the elements therein are configured for generating alarm and to propagate a malfunction signalling to at least one other element in said set. Those elements in the network to which the malfunction signalling was propagated, are excluded, preferably by way of self-exclusion, from the action of locating malfunction. Preferably the arrangement is implemented in the form of a distributed agent-based architecture, wherein each element has an associated agent for categorizing the alarm information in its possession, e.g., as related to internal malfunction, contiguous malfunction, and external malfunction. The categorized alarm information is collected, preferably via direct exchange between the associated agents, for all the elements having alarmed resources physically or logically connected with each other.