Abstract:
PROBLEM TO BE SOLVED: To switch a path for transmitting a control frame for controlling protection switching in a redundant path between two node apparatuses in linear protection switching. SOLUTION: A node apparatus includes: a monitoring section for monitoring whether or not a control frame is received via an active path; a monitoring stop section which causes the monitoring section to stop processing for monitoring whether or not a control frame is received via an active path before switching when the active system and a reserve system of redundant paths are switched; a transmission stop determining section for determining whether or not a counter-party node apparatus stops the transmission processing of a control frame via an active path after switching; and a monitor starting section which causes the monitoring section to start monitor processing for monitoring whether or not a control frame is received via the active path after switching when the counter-party node apparatus stops the transmission processing of the control frame via the active path after switching. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
A network interface apparatus is capable of bypassing an inoperable or failed network device. According to an exemplary embodiment, the network interface apparatus includes first and second transformers. A network input and a network output are respectively coupled to a first side of the first transformer and a first side of the second transformer. A terminal input and a terminal output are respectively coupled to a second side of the first transformer and a second side of the second transformer. A switch assembly is coupled to the second sides of the first and second transformers. When the switch assembly is in a first state, the second side of the first transformer is coupled to the terminal output, and when the switch assembly is in a second state, the second side of the first transformer is coupled to the first side of the second transformer bypassing the terminal output.
Abstract:
PROBLEM TO BE SOLVED: To provide a bridge apparatus with which restoration can be quickly performed when a signal is interrupted by a virtual network identifier that is used, and to provide a virtual network failure switching method. SOLUTION: A plurality of frames for conduction check of which the virtual network identifier is made variable are created and transmitted to a ring network for circulation, the conductive state of the plurality of virtual network identifiers is collected, a frame for usage status check is created and transmitted to the ring network for circulation, the usage status of the virtual network identifier of each bridge apparatus is collected, the virtual network identifier of a use state and a non-conductive state is changed to the virtual network identifier of a non-use state and a conductive state, a frame for connection change is created to provide conduction and transmitted to the ring network for circulation, and when a user port of the own device uses the virtual network identifier of the use state and the non-conductive state of the frame for connection change as an index, it is changed to the virtual network identifier of the non-use state and the conductive state of the frame for connection change. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
A network managing apparatus is connected to one of multiple OADM nodes that execute optical communication on an optical ring network configured by a two-line transmission path including of an active line and a backup line. The apparatus includes a storing unit that stores arrangement information of the OADM nodes and operating wavelength information of optical signals transmitted by the nodes. A controlling unit updates the operating wavelength information retained in the storing unit based on fault information from the OADM nodes and distributes the updated operating wavelength information to the OADM nodes.
Abstract:
PROBLEM TO BE SOLVED: To improve band use efficiency and tolerance against multiple failures. SOLUTION: A network 100 is a ring-shaped network connecting communication apparatuses 110, 120, 130 and 140 via a plurality of lines to be handled as one transmission line. The communication apparatus 110 detects a fault on any one of the plurality of lines included in a relay path set with the other communication apparatus 130 on the network 100. When any fault is detected, the relay path is switched to a path in an opposite direction on the network 100. Furthermore, a fault in any one of a plurality of lines included in the switched relay path is detected. When any fault is detected, a relay path is reset using lines, where no fault is detected, among a plurality of lines. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a structure to simplify a reconstructing network. SOLUTION: A ring based network includes a first circuit and a second circuit. The first circuit selects one of a plurality of inputs and switches an input to a first common communication line. The second circuit selects one of a second plurality of inputs and switches a second input to a second common communication line linked to one of a first plurality of inputs. A detection circuit controls switches of the first and second circuits so as to emulate a communication ring in which nodes are connected in series in a communication loop. COPYRIGHT: (C)2010,JPO&INPIT