Nippon Telegraph and Telephone Corporation

Toshihiko Seki

Mizuto Nakamura

Naoyuki Tanji

Hiroyuki Oyanagi

Osamu Okino

Atsushi Takada

Hiroki Kawahara

Takeshi Seki

Yuichiro Ishizuka

Kyoko Yamagoe

Toshiyuki Oka

Ryosuke Sato

Naoki Hayashi

A correct data generation deviceincludes: an acquisition unitthat acquires alarm information output from a plurality of devices; a correlation unitthat associates, from the alarm information, alarms whose occurrence times are within a first time width and recovery times are within a second time width, as a group of alarms that have occurred by the same event; and a generation unitthat generates correct data in which identification information of the event is set for each alarm of the group of alarms that has been associated.

Correct answer data generation apparatus, correct answer data generation method and correct answer data generation program

To make it possible to correctly understand a connection relationship of interfaces. A traffic addition deviceadds to traffic volumes output from a plurality of interfaces of a plurality of network devices A to F in a to-be-estimated network N additional traffic volumes different at the interfaces. This forms a characteristic volume in the traffic volumes. The topology estimation devicecan thus correctly understand a connection relationship of the interfaces from a correlation between the traffic volumes.

Topology deduction system, traffic addition device, and traffic addition method

A topology estimation system that estimates the connection relationship of interfaces of a plurality of devices includes: a topology estimation devicethat estimates the connection relationship of the interfaces from the correlation of traffic observed at each of the interfaces connected to each other; and a traffic generation devicethat generates traffic to be transmitted to the interfaces. The traffic generation deviceincludes: a traffic generation unitthat generates traffic so that a different feature amount appears for each set of the interfaces connected to each other; and a traffic transmitting unitthat transmits the traffic to the interfaces.

Topology estimation system, traffic generation apparatus, and traffic generation method

A system determination apparatus includes: a calculation unit configured to calculate a variation coefficient representing a degree of variation of traffic and an average traffic amount corresponding to a plurality of days using traffic data of a network apparatus corresponding to the plurality of days; and a determination unit configured to determine a system of the network apparatus using a density of a data group representing a relationship between the variation coefficient and the average traffic amount corresponding to the plurality of days, and the determination unit determines the network apparatus to be a non-operation system in a case where a density of the data group is equal to or higher than a first threshold and determines the network apparatus to be an operation system in a case where the density of the data group is lower than the first threshold.

System determination apparatus, system determination method and system determination program

In an estimation systemincluding an addition deviceand an estimation devicethe addition deviceincludes a storage sectionwhich stores address information of each interface of one of at least two network devices connected to each other, and a transmission sectionwhich transmits, at different times, a PING packet which is output to the other network device and is then returned to the one of the network devices to each interface of the one of the network devices by using the address information of the interface read from the storage section, and the estimation deviceincludes an estimation sectionwhich compares, for each time, time-series data of a data amount of each interface of the one of the network devices which includes a data amount of the PING packet and time-series data of a data amount of each interface of the other network device which includes the data amount of the PING packet, and calculates a combination of the interfaces of which the data amounts at each time match each other.

Estimation system, addition apparatus, estimation method, addition method, estimation program and addition program

A time stamp correction apparatus that corrects a deviation between time stamps of pieces of data acquired by physically connected NW apparatuses by correcting a deviation in a time stamp between pieces of traffic data is provided. The time stamp correction apparatus includes a waveform similarity computation unit that determines an IF pair based on a similarity between waveforms of time-series data of traffic observed in respective interfaces of the NW apparatuses, and a time stamp correction unit that generates correction information for correcting a deviation between the time stamps of the pieces of data based on feature points of time-series data of traffic observed in the IF pair.

Timestamp correction apparatus, time stamp correction method, and program

A traffic application amount calculation deviceincludes a calculation unitthat uses traffic data flowing to an IF of a NW device to calculate, in the IF, an average traffic amount in a transmission direction and an average traffic amount in a reception direction, a first arithmetic operation unitthat selects a direction in which an average traffic amount is smaller out of the transmission direction and the reception direction and calculates a standard deviation of the traffic amount in a selected direction that is selected, and a second arithmetic operation unitthat determines a traffic amount obtained by multiplying the standard deviation by a predetermined value as a traffic application amount to be applied to traffic in the selected direction.

Traffic application amount calculation apparatus, method and program

To prevent a delay in detection of a fault and the like and to cut down a load on a management side while making transmission of data appropriate in consideration of importance and properties of each type of the data in a case in which a large amount of data is transmitted from management target apparatuses. Items with high priority are processed first, and items with a low priority are allowed to be thinned out in accordance with priority and a weight that a management systemdefines for each data item, thereby reducing a load. The thinning out is performed by limiting the number of data items to be processed once in accordance with a load level. Data acquisition intervals and priority for each item are dynamically changed by reflecting the importance of the data of each item and a change thereof. Trends of data and the like distributed using telemetry are observed and are fed back to load control through control using an AI or a rule base. In a case in which distribution intervals of each data item are changed, the distribution intervals are changed to a multiple of a basic cycle to curb influences on correlations among the items.

Maintenance management system and data processing method

[Problem] In an optical transmission system, a position and a cause of a failure are identified while avoiding tightness of processing on a network controller side. [Solution] An optical transmission systemincludes a plurality of nodestointerconnected by an optical transmission line, a plurality of node controllerstothat detect degradation of signal quality at the nodesto, respectively, and determine a degradation mode correlated with the signal quality, and a network controllerthat identifies a node or a component in which failure has occurred based on a node for which the node controllertohas detected degradation of the signal quality, the degradation mode, a network topology formed of the nodes, and an optical path set between the nodes.

Optical transmission system and failure diagnosis method for optical transmission system

A transmission system formed by connecting sites through an optical fiber stores at least unique information of the transmission functional devices for each site, connection information, and information of wavelength resources that can be accommodated in the optical fiber in a facility DB as DB information D. When the number of wavelengths of order information for requesting the number of wavelengths required for transmission of optical signals between sites is larger than the number of wavelengths that can be accommodated in the optical fiber of the DB information D, the number of wavelengths for each of the transmission functional devices required for enabling the number of wavelengths of the order information Dto be accommodated in the optical fiber is designed using the design unit. Designed numbers of wavelengths are configured in the corresponding transmission functional devices using the configuration unit.

Transmission system and wavelength resource management method

[Problem] In a disaggregated optical transmission system formed by connecting bases including transmission apparatuses having specifications of different vendors through an optical fiber, wavelength information is easily set in the transmission apparatuses at both bases of the optical fiber such that the required wavelength is assigned to the optical fiber. [Solution] The optical transmission systemincludes a facility DBthat stores at least information on the NW configuration in which a predetermined optical signal wavelength is assigned to the optical fiber, a wavelength assignment unitthat, if the facility DBstores no information on the same NW configuration as a NW configuration that the wavelength assignment request to the optical fiberbetween bases has, associates a management number with a wavelength commonly available for different vendors, based on vendor information in which management numbers and wavelengths of vendors are associated, and further if this wavelength is assignable to the optical fiber, performs a wavelength assignment instruction by using the management number, and a wavelength setting unitthat performs wavelength assignment setting in the transmission apparatuses at both bases of the optical fiberin response to the wavelength assignment instruction.

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Tokyo, Japan

Toshihiko Seki