Abstract: A wavelength-selective device includes: a storage in which a wavelength management table is stored; and a processor configured to execute a procedure, the procedure including: searching for one or more paths used as a new path having a first ending time in a network, based on the wavelength management table; selecting a wavelength having a second ending time closest to the first ending time, from one or more wavelengths used on paths found by the searching; and configuring a path using the selected wavelength as the new path.

Abstract: A control apparatus configured to transmit first settings information including first settings contents with respect to an optical transmission device. The control apparatus includes a processor and a storage. The processor is configured to receive a setting error with respect to the first settings information from the optical transmission device, store a setting condition of the optical transmission device that is acquired from the setting error in the storage, determine second settings contents relating to transmission of an optical signal with respect to the optical transmission device based on the stored setting condition, and transmit second settings information including the second settings contents to the optical transmission device.

Abstract: A node positioned in a protection path for a working path stores identification information available to identify a source node and an end node. The identification information is contained in a signaling message transmitted to the end node through the protection path from the source node in order to set a usage reservation of the protection path. The node notifies the failure detection to an address identified by the stored identification information in response to a failure detection of the protection path.

Abstract: A path calculation device includes: a first storage that stores first topology information for indicating a topology of a network; a second storage that stores second topology information generated from the first topology information stored in the first storage; and a processor that determines a path between a start point and an end point based on the second topology information stored in the second storage and provides path information for indicating the determined path to the network when the path calculation device receives a path calculation request that includes information for indicating the start point and the end point from the network. The processor updates the second topology information stored in the second storage based on the determined path.

Abstract: A protection channel provisioning method includes: reserving a first protection channel corresponding to a first work channel and a second protection channel corresponding to a second work channel; provisioning a shared protection channel by configuring a circuit of node equipment provided on a shared route on which the first protection channel and the second protection channel are redundantly reserved so that a data signal of the first work channel or a data signal of the second work channel is transmitted via the shared route; and configuring a circuit of branch node equipment provided in a branch node at which the shared protection channel is guided to a first node corresponding to the first protection channel and a second node corresponding to the second protection channel so that the data signal transmitted via the shared protection channel is not guided to the first node and the second node.

Abstract: A wavelength-selective device includes: a storage in which a wavelength management table is stored; and a processor configured to execute a procedure, the procedure including: searching for one or more paths used as a new path having a first ending time in a network, based on the wavelength management table; selecting a wavelength having a second ending time closest to the first ending time, from one or more wavelengths used on paths found by the searching; and configuring a path using the selected wavelength as the new path.

Abstract: A node positioned in a protection path for a working path stores identification information available to identify a source node and an end node. The identification information is contained in a signaling message transmitted to the end node through the protection path from the source node in order to set a usage reservation of the protection path. The node notifies the failure detection to an address identified by the stored identification information in response to a failure detection of the protection path.

Abstract: A protection channel provisioning method includes: reserving a first protection channel corresponding to a first work channel and a second protection channel corresponding to a second work channel; provisioning a shared protection channel by configuring a circuit of node equipment provided on a shared route on which the first protection channel and the second protection channel are redundantly reserved so that a data signal of the first work channel or a data signal of the second work channel is transmitted via the shared route; and configuring a circuit of branch node equipment provided in a branch node at which the shared protection channel is guided to a first node corresponding to the first protection channel and a second node corresponding to the second protection channel so that the data signal transmitted via the shared protection channel is not guided to the first node and the second node.

Abstract: The communication method and the subsidiary transmission apparatus for a point-to-multipoint communication system in which the subsidiary transmission apparatus autonomously establishes point-to-multipoint communication between one main transmission apparatus and multiple subsidiary transmission apparatuses, without manually operating switches of the subsidiary transmission apparatuses.

Abstract: A disclosed communication apparatus includes a protocol processing unit configured to send and receive link information on a link in a network having a redundant configuration according to a protocol, to build topology information of the network from the link information, and to set up a path in the network based on the topology information. The protocol processing unit includes a link information advertising unit configured to advertise the link information including, for each of protection types of the link, information used to set up the path, a topology information storing unit configured to store the topology information, and a link information receiving unit configured to receive the link information and to store the received link information in the topology information storing unit.

Abstract: There is provided a communication device including a score information storage unit to store score information indicating a score as an evaluated value of a communication path; a receiver unit to receive a route connection notice including current score information; a routing unit to acquire the score information stored in the score information storage unit, and select the communication path next to the communication path based on the acquired score information of the communication path; a score updating unit to add a score of the communication path selected by the routing unit to the current score of the partial communication route indicated by the current score information, and update the current score information to the added score as a new current score; and a transmission unit to transmit the route connection notice including the current score information.

Abstract: Two path setting sides are determined between a pair of nodes in a network, and two path setting messages are created. The two path setting messages each includes information on a path switch default direction, a wait-to-restore timer value, and a mode identifier identifying a revertive mode. Then the two different communication paths are concurrently set between the pair of nodes by transmitting concurrently the created two path setting messages between the pair of nodes. In the case of the revertive mode, a communication path set on a side identified by the path switch default direction is operated as a working path either in an initial state or when no faults have occurred during a time period indicated by the wait-to-restore timer value after recovery of the fault on the first side.

Abstract: A management network for managing networks managed individually by a plurality of groups, wherein authorization and unauthorization of access for supervision and control are automatically set. Each network element is assigned a TID, as a prefix, having a group ID identifying a group to which the network element belongs. Topology information considered from each network element to all network elements includes a group ID. When a group ID included in the received topology information matches the prefix of the TID assigned to its own network element, the source is registered at the authorized side of the access authorization list (step 1012), while when it does not match, it is registered at the unauthorized side (step 1016).

Abstract: The present invention provides a line accommodation device comprising at least one first communication control unit for controlling information transmission/reception to/from a first communication system, at least one second communication control unit for controlling information transmission/reception to/from a second communication system using the first communication system as a communication medium and a route control unit for controlling the switching of an information transfer route between the first and second communication unit.

Abstract: There is provided a communication device including a score information storage unit to store score information indicating a score as an evaluated value of a communication path; a receiver unit to receive a route connection notice including current score information; a routing unit to acquire the score information stored in the score information storage unit, and select the communication path next to the communication path based on the acquired score information of the communication path; a score updating unit to add a score of the communication path selected by the routing unit to the current score of the partial communication route indicated by the current score information, and update the current score information to the added score as a new current score; and a transmission unit to transmit the route connection notice including the current score information.

Abstract: A management network for managing networks managed individually by a plurality of groups, wherein authorization and unauthorization of access for supervision and control are automatically set. Each network element is assigned a TID, as a prefix, having a group ID identifying a group to which the network element belongs. Topology information considered from each network element to all network elements includes a group ID. When a group ID included in the received topology information matches the prefix of the TID assigned to its own network element, the source is registered at the authorized side of the access authorization list (step 1012), while when it does not match, it is registered at the unauthorized side (step 1016).

Abstract: Two path setting sides are determined between a pair of nodes in a network, and two path setting messages are created. The two path setting messages each includes information on a path switch default direction, a wait-to-restore timer value, and a mode identifier identifying a revertive mode. Then the two different communication paths are concurrently set between the pair of nodes by transmitting concurrently the created two path setting messages between the pair of nodes. In the case of the revertive mode, a communication path set on a side identified by the path switch default direction is operated as a working path either in an initial state or when no faults have occurred during a time period indicated by the wait-to-restore timer value after recovery of the fault on the first side.

Abstract: A communication apparatus, in a communication network in which a plurality of routes can be set with respect to a destination, acquires a line condition of a communication line in each route, calculates a communication cost of each route, based on the line condition of the communication line in the route, and selects a route from the plurality of routes based on the communication cost calculated. The line condition is acquired at regular intervals to thereby update the communication cost.

Abstract: A transmission apparatus in a network where a path is set up is disclosed that includes a processing part configured to transmit a frame of the network to an egress node of the path when being set as an ingress node of the path, the frame having setup information of the path written therein, and to loop back the frame when being set as the egress node, the frame having response information written therein based on the setup information read from the frame, the response information indicating that the path is set up correctly.

Abstract: A transmission apparatus having a function of establishing a connection of a path that is a signal communications channel in a communications network includes a masking part configured to mask an alarm detected after the connection of the path is established in the transmission apparatus; an alarm status detection part configured to detect a change in the status of the alarm; and an unmasking part configured to unmask the alarm masked by the masking part in response to the alarm status detection part detecting the change in the status of the alarm.