Nippon Telegraph and Telephone Corporation

Daisaku Shimazaki

Hideki Maeda

Masahiro Yokota

Masaaki Inami

Masatoshi Namiki

Eiji Oki

Naoaki Yamanaka

Yuji Minato

Kohei Shiomoto

Katsuhiro Araya

Hiroto Takechi

Wataru Imajuku

Hiroki Kawahara

Naohide Nagatsu

Yoshihiro Takikawa

The network device information management apparatus includes: a log data acquisition unit configured to acquire log data from each of the plurality of devices, the log data including information about components of the plurality of devices; and an inventory information estimation unit configured to exclude a common portion of the log data before and after registration of the component to extract a component configuration indicating information about the component newly registered to the device, compare the extracted component configuration with the component configuration extracted from a component registered to another device, estimate the common portion as inventory information, and store the estimated inventory information in storage means.

Network apparatus information management device and network apparatus information management method

A monitoring control unit () of an OXC () stores a management table () in which pieces of information regarding a modulation mode, an FEC, and a frame mode of an optical signal are associated with each other, and sequentially changes the modulation mode, the FEC, and the frame mode according to the management table () upon an LOS alert from a relay-side optical input/output unit () or an LOF alert from a DSP () being input thereto. Upon successfully receiving an appropriate optical signal according to the change, the monitoring control unit () acquires transmission source information included in the optical signal, and detects an occurrence of erroneous connection of an optical transmission line in an OXC (), which serves as a relay apparatus, when the acquired transmission source information indicates an optical cross-connect apparatus that is a transmission source different from an original transmission source.

Optical cross-connect device, optical transmission system, and optical transmission line connection error detection method

A transmission device () includes a flow table () that stores identification information about an uninterruptible target flow; a transmission-side identification unit () that identifies whether a received packet is from the target flow or a non-target flow based on whether the received packet matches the identification information about the target flow stored in the flow table (); a tag application unit () that applies, to packets from the target flow, an uninterruptible identifier indicating that the packets are from the target flow and a sequence number for distinguishing the packets from other packets; and a branch unit () that branches the packets from the target flow processed by the tag application unit () into packets to be transferred to an active path () among redundant routes and packets to be transferred to a backup path () among the redundant routes.

Transmitting device, receiving device, packet transfer system,packet transfer method, and packet transfer program

[Problem] A transmission system, an apparatus management server, a failure management method, and a program enabling the cause of a failure associated with a silent change of an article to be swiftly identified are provided. [Solution] An apparatus management serverof a transmission system includes a collection unit configured to collect history information on an introduction instance of articles to an optical transmission apparatusand an information analysis unitconfigured to visualize and display, based on the history information collected, a graph in which a starting date of use for each of the articles is associated with the number of introductions of the article.

Transmission system, device management server, fault management method, and program

A management device of a transmission system includes a new path information input unit, a statistical information collecting unit that collects statistical information of actual traffic from nodes, and an uninterruptible path designing unit that calculates a delay fluctuation in an entire path with respect to a fluctuation for each section of the path, and designs a path in which the calculated delay fluctuation is smaller than a maximum fluctuation amount according to a buffering amount in the reception node as an uninterruptible path, a path information setting unit that updates path information of the path and stores the updated path information in an existing path information storage unit, and sets a bandwidth permitted in a node constituting the path in the node, and a notification unit that notifies a user of a path that was not designed as the uninterruptible path.

Transmission system management device and transmission system design method

A network is realized having GMPLS and IP/MPLS mixed, in which an IP/MPLS node can be operated as is without replacing the IP/MPLS node with a node having a GMPLS function, even if the GMPLS and IP/MPLS are mixed. To match with the protocol of the IP/MPLS node outside of a GMPLS cloud, the GMPLS+IP/MPLS node (edge) establishes a PSC-LSP between GMPLS+IP/MPLS nodes (edge), uses the PSC-LSP as an IP/MPLS link from the viewpoint of the IP/MPLS node, and operates signaling of an MPLS-LSP establishment requested from the IP/MPLS.

GMPLS+IP/MPLS node and IP/MPLS node

A layered network node of which a network it belongs is divided up into cells which are constituted by a plurality of nodes; the cells are defined as virtual nodes; if links exist which connect the interiors of the virtual nodes and the exterior, contact points between them are defined as interfaces of the virtual nodes; the virtual network constituted by the virtual nodes is further divided up into cells and making them into virtual nodes; said virtual network is defined as a network of a higher level with respect to the initial virtual network; by performing said operation of division into cells and making into virtual nodes once or a plurality of times, the layered network is constituted; path computation is performed from the source node to a destination node in a stepwise manner by dispersing it over the various layers.

Layered network node, network incorporating the same, node, and layered network

The present invention relates to a node, a packet communication network, and a packet communication method and program. The node of the present invention is one which includes a section which advertises to other nodes link state information which indicates the state of links which are connected to this node, a section which establishes a packet forwarding path according to the link state information which is included in the advertisement by the advertisement section, and a traffic observation section which observes the traffic and outputs its observations as traffic observation results.

Node, packet communication network, packet communication method, and program

A multi-layer photonic network and nodes used therein are provided. The multi-layer photonic network comprises a packet network which performs switching and transfer in packet units, and a photonic network comprising optical transmission lines and photonic switches, and which accommodates the packet network. The multi-layer photonic network also has a two layer structure of optical wavelength links (O-LSPs) and packet links (E-LSPs). The O-LSPs are constituted by the optical transmission lines and comprise optical wavelength switching capability (LSC) which is capable of switching in optical wavelength units and packet switching capability (PSC) which is capable of switching in packet units at both their ends. The E-LSPs include the O-LSPs and PSCs at both their ends. Each node includes a section for automatically establishing an O-LSP according to an establishment request for an E-LSP while taking account of path information including path cost, resource consumption, and traffic quantity.

Growing community of inventors

Tokorozawa, Japan

Daisaku Shimazaki