Abstract: A transmission device that is coupled to a mesh network includes a memory, and a processor coupled to the memory, configured to detect an another transmission device in the mesh network, which receives a first data signal that is same as a second data signal requested to the transmission device, and branch the first data signal to the transmission device from the detected another transmission device.

Abstract: A noise suppression method is used in an optical transmission system which includes node equipments transmitting a WDM optical signal. First node equipment drops a first optical signal from the WDM optical signal. The method includes: transmitting a failure signal that specifies the first optical signal from second node equipment to the first node equipment via a first route when the second node equipment arranged on the first route for transmitting the first optical signal to the first node equipment has detected a failure of the first optical signal; transmitting a shutoff signal that specifies the first optical signal from the first node equipment toward the second node equipment via the first route; and shutting off an optical output of a wavelength corresponding to the first optical signal in third node equipment that has relayed the failure signal and has received the shutoff signal.

Abstract: A failure protection method of a network connecting between nodes by multiple working paths and a protection path is disclosed. An allocation bandwidth is determined to allocate to a detected path where a failure is detected in multiple paths being set to the multiple working paths, depending on the detected path. The detected path is switched from one of the multiple working paths to the protection path. Data to be transmitted by the detected path is transmitted by using the allocation bandwidth determined within an entire bandwidth of the protection path.

Abstract: A transmission device includes a receiver which receives a wavelength multiplex optical signal having a plurality of optical signals different in terms of wavelength multiplexed, a generator which generates notification signals, which notify another device of a failure in reception of the wavelength multiplex optical signal, for optical signals which are separated from the wavelength multiplex optical signal and which are transmitted to the other device, out of the plurality of optical signals, in accordance with frame types of the optical signals, and one or more transmitters which respectively convert the notification signals into wavelength optical signals having the same wavelengths as the optical signals out of the plurality of optical signals have and which respectively transmit the wavelength optical signals in place of the optical signals to the other device when the wavelength multiplex optical signal is not received in the receiver.

Abstract: An optical transport network system includes a plurality of NEs, each transmitting wavelength-multiplexed optical signals. Each NE includes a routing information DB that is used to store reachable area information, which contains identifiers of other NEs in a range within which the optical signals can be transmitted from the own NE without using an REG. A FROM NE includes a path candidate searching unit that searches for a plurality of path candidates for transmitting optical signals from the FROM NE to a TO NE. The TO NE includes a path selecting unit that selects a path for transmitting optical signals from among a plurality of path candidates. The path selecting unit obtains the number of times for which the REG is used for each of the plurality of path candidates; and, based on each number of times that is obtained, selects a path for transmitting the optical signals.

Abstract: A transmission device that is coupled to a mesh network includes a memory, and a processor coupled to the memory, configured to detect an another transmission device in the mesh network, which receives a first data signal that is same as a second data signal requested to the transmission device, and branch the first data signal to the transmission device from the detected another transmission device.

Abstract: A failure protection method of a network connecting between nodes by multiple working paths and a protection path is disclosed. An allocation bandwidth is determined to allocate to a detected path where a failure is detected in multiple paths being set to the multiple working paths, depending on the detected path. The detected path is switched from one of the multiple working paths to the protection path. Data to be transmitted by the detected path is transmitted by using the allocation bandwidth determined within an entire bandwidth of the protection path.

Abstract: A noise suppression method is used in an optical transmission system which includes node equipments transmitting a WDM optical signal. First node equipment drops a first optical signal from the WDM optical signal. The method includes: transmitting a failure signal that specifies the first optical signal from second node equipment to the first node equipment via a first route when the second node equipment arranged on the first route for transmitting the first optical signal to the first node equipment has detected a failure of the first optical signal; transmitting a shutoff signal that specifies the first optical signal from the first node equipment toward the second node equipment via the first route; and shutting off an optical output of a wavelength corresponding to the first optical signal in third node equipment that has relayed the failure signal and has received the shutoff signal.

Abstract: In a transmission network system in which a path is set between a transmission node and a receiving node and which transmits a transmission signal between the nodes, crossconnect settings of the nodes are enabled while personal settings are minimized. A transmission node has a first path-setting-receiving section; transmission-path-setting change sections; and change insertion sections which report information about a change in path setting received by said path-setting-receiving section by inserting the information into a transmission signal to be transmitted from the node to a receiving node. The receiving node has a second path-setting-receiving section and receiving-path-setting change sections for changing path settings of the node on the basis of the information about a change in path setting.

Abstract: In a transmission network system in which a path is set between a transmission node and a receiving node and which transmits a transmission signal between the nodes, crossconnect settings of the nodes are enabled while personal settings are minimized. A transmission node has a first path-setting-receiving section; transmission-path-setting change sections; and change insertion sections which report information about a change in path setting received by said path-setting-receiving section by inserting the information into a transmission signal to be transmitted from the node to a receiving node. The receiving node has a second path-setting-receiving section and receiving-path-setting change sections for changing path settings of the node on the basis of the information about a change in path setting.

Abstract: In a transmission network system in which a path is set between a transmission node and a receiving node and which transmits a transmission signal between the nodes, crossconnect settings of the nodes are enabled while personal settings are minimized. A transmission node has a first path-setting-receiving section; transmission-path-setting change sections; and change insertion sections which report information about a change in path setting received by said path-setting-receiving section by inserting the information into a transmission signal to be transmitted from the node to a receiving node. The receiving node has a second path-setting-receiving section and receiving-path-setting change sections for changing path settings of the node on the basis of the information about a change in path setting.