Nippon Telegraph and Telephone Corporation

Nippon Telephone and Telegraph Corporation

Namiko Ikeda

Shuhei Yoshida

Koyo Nitta

Yuta Ukon

Shoko Oteru

Satoshi Shigematsu

Hiroyuki Uzawa

Saki Hatta

Kenji Kawai

Nobuyuki Tanaka

Hiroki Morimura

Yukio Okazaki

Takahiro Hatano

Junichi Kato

Tomoaki Kawamura

Mamoru Nakanishi

Shoko Ohteru

Katsuyuki Machida

Hakaru Kyuragi

Naoki Miura

Yuki Arikawa

Koji Fujii

Yusuke Sekihara

A traffic monitoring device includes an identification unit that identifies a flow of a packet received from a monitoring target network into a flow of a first flow group and a second flow group other than the first flow group on the basis of a rule table in which a predetermined rule is registered, a traffic aggregation unit that aggregates a traffic amount of the first flow group for each flow, an occurrence probability calculation unit that calculates an occurrence probability of each flow on the basis of a result of sampling at least some of the flow of the packet received, and a traffic estimation unit that estimates a traffic amount of each flow of the second flow group by multiplying the occurrence probability of each flow by the total value of the traffic amount of the second flow group.

Traffic monitoring device and traffic monitoring method

A burst traffic detection device includes a packet receiver configured to receive packets from a network, a flow specification device configured to specify, in accordance with header information of the packets, flow rules, a flow information storage device configured to store flow information of the specified flow rules, a statistical information storage device configured to store statistical information including the total number of packets for each flow rule and/or the total number of bytes for each flow rule, a burst detection device configured to detect the occurrence of burst traffic in accordance with the statistical information, and a detection count storage device configured to store the number of times of the occurrence of burst traffic.

Burst traffic detection device and method

An embodiment is a data sequence correction method. The data sequence correction method including temporarily saving data with sequence information imparted thereto in a ring buffer, the ring buffer having a predetermined number of storage regions corresponding to the sequence information, and being provided with a monitoring section made up of one, or two or more consecutive sequence numbers, and an acceptance section in which a start or a second sequence number of the monitoring section is a start sequence number, and the sequence number ahead by a count of storage regions of the ring buffer including the start of the monitoring section is an end sequence number.

Data sequence amendment method, packet monitoring apparatus, data sequence amendment device, and data sequence amendment program

A traffic monitoring apparatus that monitors traffic of a monitoring target network and includes a statistical information processor that acquires statistical information per specific flow of the traffic, and a packet capture unit that captures a packet of the specific flow, in which the statistical information processor includes a statistical information aggregation unit that aggregates the pieces of statistical information, and a statistical information file generation unit that generates a statistical information file based on the pieces of aggregated statistical information.

Traffic monitoring device, traffic monitoring method, and traffic monitoring program

A traffic monitoring apparatus includes: a header analysis circuit configured to acquire one or more identifiers from a header of a received packet; a rule registration circuit configured to convert a rule table including rules in which one or more rule elements are registered for each of the rules into a predetermined format and register the rule table in a rule matching circuit; and the rule matching circuit configured to search for rules to be matched with the acquired identifiers.

Traffic monitoring device, and traffic monitoring method

A data sequence correction method for temporarily saving data with sequence information in a ring buffer and performing sequence correction is provided. The ring buffer includes a number of storage regions, a monitoring section having one or more continuous sequence numbers, and an acceptance section having a first or second sequence number of the monitoring section as a start sequence number and a sequence number immediately preceding the start sequence number of the monitoring section as an end sequence number. The method includes, when a value determined based on a remainder obtained by dividing a sequence number of received data by the number of storage regions is inside the acceptance section, writing the received data in a position of the storage region corresponding to the determined value, and when data are written in the entire monitoring section, reading out all the data in the monitoring section.

Data sequence correction method, packet monitoring device, data sequence correction device, and data sequence correction program

A state detection circuit compares a target connection with an immediate previous connection based on an identifier of an incoming packet and detects a post-transitional state of the target connection based on a control flag of the incoming packet and on a pre-transitional state of the target connection detected just before if the target connection is identical with the immediate previous connection; and a connection counting circuit increments or decrements the number of target connections only when the detected post-transitional state indicates a start or end of the target connection.

Network monitoring device and connection counting method

An embodiment packet capture device comprises: a packet receiver configured to receive a packet from a network; a packet retainer configured to store the received packet in a memory to temporarily retain the received packet; a failure detector configured to determine a communication failure is present in the network; a capture controller configured to determine an operation stop address such that retention of packets from the network in time periods before and after a detection time point of the communication failure is ensured when the communication failure is detected by the failure detector; and a capture data generator configured to output the packet stored in the memory as capture data when a storage destination address of the packet stored in the memory has reached the operation stop address or when at least a predetermined waiting time period has elapsed from the detection time point of the communication failure.

Apparatus and method for capturing packets before and after network communication failure

An upstream allocation circuit () and a downstream allocation circuit () are provided in an OLT (). For example, a superimposed frame obtained by bundling upstream frames (upstream control frames+upstream data frames) from all ONUS is input to the upstream allocation circuit () via a frame reproduction circuit (-). The superimposed frame may be generated at the stage of optical signals or generated after converting optical signals into electrical signals. The upstream allocation circuit () allocates each of the upstream control frames bundled into the superimposed frame to a predetermined PON control circuit () based on information (PON port number or LLID) added to the frames. The downstream allocation circuit () allocates, to a preset frame reproduction circuit (), each downstream control frames output from the PON control circuits ().

Station-side apparatus in optical transmission system and optical transmission system

A selection and distribution circuit () is provided between N optical transceivers () and one PON control circuit (). The selection and distribution circuit () selects the optical transceiver () corresponding to an upstream frame that time-divisionally arrives, thereby transferring the upstream frame opto-electrically converted by the transceiver () to the PON control circuit () and distributing a downstream frame from the PON control circuit () to each optical transceiver (). A power supply control circuit () stops power supply to at least one of one of optical transceivers () that are not used to transfer the frame of the optical transceivers () and a circuit that is not used to transfer the frame in the selection and distribution circuit (). This can reduce the system cost per ONU in the optical transmission system.

Station-side device and optical transmission system

This invention includes an image quality priority level decision processing unit () which evaluates the magnitude of an image quality of each of a plurality of first image data formed from biometric images associated with the same target on the basis of a specific index having the relationship of a monotone function with authentication accuracy of biometric authentication, and outputs each of the first image data upon adding a priority level thereto on the basis of the evaluation result, a first image storage () unit which stores each of the first image data having a priority level added thereto from the image quality priority level decision processing unit (), a second image storage unit () which stores second image data used for comparison/collation with the first image data, an image collation unit () which compares/collates the second image data stored in the second image storage unit () with the first image data stored in the first image storage unit () and outputs the comparison/collation result, and a control unit () which controls each of the units. The control unit () causes the image collation unit () to compare/collate the second image data stored in the second image storage unit () with the first image data stored in the first image storage unit () in accordance with the priority levels, and outputs the comparison/collation result from the image collation unit ().

Biometric image collation apparatus and collation method therefor

An image processing apparatus includes an image correcting section. When an image of an object is input, the image correcting section performs correction processing for the input image including the object image and outputs the corrected image as an image required for authentication of the object. An image processing method is also disclosed.

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Tokyo, Japan

Namiko Ikeda