Hitachi, Ltd.

Hitachi Communication Technologies, Ltd.

Tohru Setoyama

Takeshi Ishizaki

Osamu Takada

Hideya Yoshiuchi

Shigeki Morimoto

Masatoshi Takihiro

Hidehiro Fukushima

Masato Tsukakoshi

Nobukazu Doi

Kenichi Yoshida

Takehiro Morishige

In order to provide a redundancy configuration to an access gateway apparatus in which a control plane and a user plane are separated, the access gateway apparatus includes: a control computer for receiving control signals from the networks to establish the communication path, thereby determining packet transfer information for the data; and a transfer computer for receiving the packet transfer information from the control computer to transfer the data through the communication path. The transfer computer includes: a plurality of first transfer computers for executing the transfer of the data; and a second transfer computer for taking over, when a fault occurs in any one of the plurality of first transfer computers. The control computer includes: a first control computer for processing the control signals received from the networks; and a second control computer for taking over, when a fault occurs in the first control computer.

Control method for access gateway and communication system

Disclosed here is an integrated application system for enabling a new application to be added and a user to select an optional application easily. The integrated application system includes a plurality of clients for receiving services from a plurality of application servers for supplying a plurality of services and a management apparatus for controlling services supplied by the application servers to the clients according to an integrated service starting request from any of clients. Each of the clients includes a client management unit for controlling participation of a plurality of application clients corresponding to a plurality of services in an integrated service. The client management unit selects each application used in the integrated service and a client that participates in the integrated service respectively and sends an integrated service starting request to the management apparatus while the management apparatus instructs each of the selected application servers to start a service according to the integrated service starting request from the client management unit.

Integrated application management system, apparatus and program, and integrated session management server, system, program and server chassis, and communication system, session management server and integration application server

Integrated application management system, apparatus and program, and integrated session management server, system, program, and apparatus

The object of the present invention is to provide a communication network system that reduces the burden of entering settings for the network system. A service directory server in the communication network system provides unified management of the service information of the service-providing server installed in the network. The service information managed by the service directory server is distributed to the communication nodes either automatically or in response to requests from a communication node. The communication nodes receive packets and, for received packets that are addressed to itself, a service-providing server destination is determined based on the service information provided by the service directory server and the packet is transferred to the server to receive the service.

Communication network system and method for controlling services in a communication network system

Switches create and manage routes with route control protocols such as BGP-4, PNNI, etc. and a route management apparatus is notified of the information of the routes, created by these protocols, and the route management apparatus verifies the validity of a route of which the apparatus is notified by a switch based on the route information of the whole network composed of the plurality of pieces of information given by respective switches and the management policy set by a network manager. In the verification of validity, it is confirmed that the transmitted data are able to arrive at the destination securely and the set route is not against the management policy, and the route-usage-permission-notice of a route confirmed of its validity by the route management apparatus is transmitted to respective switches. Thereby, in the route control of a network using a route control protocol, it is made possible to prevent the occurrence of an abnormal route caused by the difference in the speed of operations of respective switches or an erroneous setting of a switch.

Network system having route verification function and the component apparatuses and method thereof

A multiplex router device, having a multiplex configuration, is instrumental in reducing internal and external traffic flows for a routing protocol process that occurs at a time of system switchover. A data base integration module, in a route calculation unit in the active mode, stores network link-state information collected by a routing protocol packet transmission-reception module in a link-state data base, and at the same time sends the information to a route calculation unit, but does not send routing protocol information collected. In the route calculation unit in the standby mode, a data base integration module that received the network link-state information stores its contents into its own link-state data base. When a failure occurs in the route calculation unit in the active mode, the route calculation unit performs the routing protocol process by using the stored link-state data base.

System and method for using active and standby routers wherein both routers have the same ID even before a failure occurs

Multiplex router device comprising a function for controlling a traffic

A data signal and a sync signal outputting apparatus comprises a memory for storing a serial signal selector circuit for selectively producing an output signal SD of the memory or the serial signal. The output circuit extracts a sync pattern, and a data section from the selector output signal. A sync pulse is generated for each sync pattern to produce a sync signal CK. At the same time, each data block is produced in parallel to the sync signal CK as a data signal S.sub.0. A controller, upon detection of an extraction failure, controls the memory in such a manner as to produce the stored serial signal from the memory and controls the selector to select an output signal from the memory.

Data and synchronization signal outputting apparatus for recovering

A signal processing device is provided with a plurality of signal processing circuits which are integrated on a monolithic semiconductor chip and which execute a plurality of predetermined signal processing stages. Signal input terminals are connected with predetermined one of the signal processing circuits for receiving input signals necessary for the plurality of signal processing stages. A first signal output circuit outputs the final signal processing result while a second signal output circuit outputs the intermediate processing results obtained from the signal processing circuits other than a signal processing circuit which performs the final stage signal processing. A plurality of selection circuits are respectively located on each of signal transfer paths for transferring the intermediate signal processing result to a succeeding signal processing circuit. Each selection circuit is provided with supplemental signal input terminals for externally receiving signals, respectively, and each of said selection can serve to select either of the intermediate signal processing result or the signal received at a supplemental signal input terminal on the basis of a predetermined control signal, with the selected signal being supplied to the succeeding signal processing circuit.

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Fujisawa, Japan

Tohru Setoyama