Fujitsu Corporation

Toshimasa Fukui

Osamu Isono

Tetsuo Tachibana

Tetsuo Nishino

Eisuke Iwabuchi

Ryuji Hyodo

Shunji Abe

Ryoichi Ishibashi

Tatsuru Nakagaki

Kazuo Hajikano

Hichiro Hayami

Toshiyuki Hijikata

Emi Hata

Koso Murakami

Katsumi Sekine

Emi Kawasaki

Norimasa Yano

A picture distribution service system carries out a distribution control of picture information service in a broadband transit switching network having a hierarchical structure. The system comprises a plurality of transit switches for switching transit lines through which picture information is transmitted from a source and distributed by a center switch, a first trunk part provided for each of the transit switches for distributing the picture information from the center switch to the transit lines, a plurality of subscriber switches for switching subscriber lines through which the picture information from each of the transit lines is transmitted to a plurality of subscriber terminals, and a second trunk part provided for each of the subsriber switches for distributing the picture information from each of the transit switches to the subscriber lines.

Picture distribution service system

The invention provides a picture phone terminal and an exchange for use, for example, with a picture phone interrupt service system for a broadband ISDN which makes it possible to confirm, when an incoming call arrives, during communication between a plurality of picture phones, at one of the picture phone terminals from a third picture phone terminal, the incoming call during the communication without disturbing the communicating condition at present. The picture phone terminal or the exchange comprises means for receiving image information from a second picture phone terminal with which the picture phone terminal is communicating, means for receiving interrupt notifying image information representing that an incoming call from a third picture phone terminal has arrived, image composing means for composing the image information from the second picture phone terminal with which the picture phone terminal is communicating and the interrupt notifying image information from the third picture phone terminal, and display means for displaying the composite image information composed by the image composing means.

Picture phone terminal interrupt function and picture phone terminal

The present invention relates to a service system for interconnection between different kinds of communication terminals and to a communication node device and a communication terminal used in the same. The object of the invention is to offer versatility and to need no operation for media conversion by an originating party. An information factor indicating a communication terminal attribute is inserted in a message to establish a call between a communication terminal and a communication node device. In the communication node device, when a communication refusal from a destination communication terminal due to a communication terminal attribute disagreement is recognized in response to a destination message sent from the originating communication terminal to the destination communication terminal, a medium receivable by the destination communication terminal is selected and the destination message from the originating communication terminal is corrected. The corrected message is forwarded to the destination communication terminal. Then when communication is established, the media converting means notifies the destination communication terminal of the destination call from the originating communication terminal, while it notifies the originating communication terminal of a communication establishment through the media conversion.

Service system for interconnecting heterogeneous communication

One of a plurality of subscribers connecting via a communications line a signal line and switching units, each accommodating a subscriber line connected to a terminal, etc., lowers the communication quality of the communications to reduce the cost of communications. A calling or called subscriber issues to a switching unit an instruction to lower the communication quality. A control unit in one of the switching unit receives the instruction, analyzes a method of lowering the communication quality and determining a switching unit for performing it, generates a control signal indicating that the communication quality should be lowered, and sends via a signal line the control signal to the switching unit determined to be used for lowering the communication quality. After receiving the control signal, a polishing unit in that switching unit lowers the communication quality by discarding a part of communication contents of the communications according to the control signal, or lowering the priority of the communication contents. Thus, communications fees can be greatly reduced.

Bidirectional communication apparatus for reducing transmitted data

In an accounting system in a B-ISDN offering video programs to a plurality of subscriber terminals coupled thereto, a timer, and an account controller are provided in each of the subscriber terminals. The timer starts to count time when a subscriber terminal receives a video program offered from the network. The account controller determines whether or not a count time in the timer has reached n sec. (e.g. 300 sec.), and transmits account starting information to the network when it is determined the count time in the timer has reached n sec.. The account controller also transmits account termination information to the network when the subscriber terminal discontinues receipt of the video program. The network is provided with an accounting unit for performing a accounting process with respect to each of the subscriber terminals from which the account starting information and the account termination information are transmitted, the accounting process starting from a time at which the network receives the account starting information to a time at which the network receives the account termination information.

Accounting system in network for offering video programs

A telemetry supervisory system in an asynchronous transmission mode network which discriminates less information when less variation rates occur and more information when more variation rates occur, and provides a transmission system for transmitting the discriminated information as a cell having a fixed length, includes an object detecting and monitoring device, a coder for coding picture signals from the detecting and monitoring device, a transmission unit which changes the output of the coder into cells each having a fixed length and a monitor station. Monitoring information such as a picture image or sound from a monitored object is transmitted by the transmission unit for a discrimination of the information. A number of cells transmitted as data is monitored at the receiving side, e.g. monitor station, and a variation of the number of cells is treated as a change in the state of the monitored object.

Telemetry monitoring method and device therefor for transmitting

A routing method routes cells which are transferred through one of a plurality of paths within an asynchronous transfer mode (ATM) switching system selected by routing information. The routing method includes the steps of adding first routing information to incoming cells at an input stage of the ATM switching system when supplying the cells to the ATM switching system, generating a route switching confirmation cell in response to a route switching instruction and for adding second routing information to incoming cells thereafter so as to supply the route switching confirmation cell and the cells added with the second routing information to the ATM switching system. The second routing information is different from the first routing information and is determined by the route switching instruction, comparing routing information. The method also includes the cells with the second routing information at an output stage of the ATM switching system in response to the route switching instruction, and outputting each cell from the ATM switching system having routing information different from the second routing information as it is. The method also includes temporarily storing each cell from the ATM switching system having routing information identical to the second routing information and reading out and outputting the stored cell after the route switching confirmation cell is output from the ATM switching system.

Routing method and routing system for switching system having a

A self-routing switching system connected between input highways and output highways, includes conversion modules, doubled SRM networks, output modules, and first and second selectors. Normally, one of the SRM networks is connected between the conversion modules and output modules through the first and second selectors. When a request to switch the active network to the other SRM network is received, the first and second selectors switch connections to the conversion modules and output modules so that the other SRM network is connected between the conversion modules and output modules. Before actually switching the connections, it is determined whether or not all cells have been discharged from the active SRM network.

Self-routing switching system having dual self-routing switch module

A transmission control system in which terminals are connected to an ATM switching network, has a table circuit registering virtual channels presently formed in the ATM switching network in a management table, and a retrieval part for receiving a communication request from one of the terminals and for determining whether or not the management table registers a virtual channel corresponding to the communication request. Data output from one of the terminals is transferred to a different one of the terminals addressed by the communication request through the virtual channel corresponding to the communication request and corresponding two of the terminal adapters, when the retrieval part determines that the management table has the virtual channel corresponding to the communication request. A virtual channel setting part registers the virtual channel corresponding to the communication request in the management tabele, when the retrieval processor determines that the management table does not have the virtual channel corresponding to the communication request. Data output from the one of the terminals is transferred to the different one of the terminals addressed by the communication request through the virtual channel registered in the management table by the virtual channel setting part.

System for controlling data transmission in ATM switching network

An information distribution system includes a node station and a plurality of terminal devices connected through transmission lines with the node station. The node station includes a distribution information storage unit for storing information which is to be distributed to the plurality of terminal devices, and a re-transmission request response unit for re-transmitting information in question in response to requests from the plurality of terminal devices. Each of the terminal devices includes an error checking unit for checking transmission failure in the data transmission based on the received information. The transmitted information is divided into a plurality of blocks, and, after the completion of reception of all block-form information, a re-transmission of information is requested, and based on this request, a re-transmission of information is carried out.

Information distribution system

Self-routing switching system with multiple link connections between

Disclosed is a ring transmission system which incorporates both a narrowband network and a broadband ISDN network. The system comprises a plurality of nodes connected to a ring line. Each node comprises a drop/insert unit for dropping/inserting data by the use of a communication channel allocated to the node and an allocation changing circuit, whereby, a plurality of independent narrowband and broadband exchange networks are connected to a single ring transmission line.

Communication system for forming different networks on the same ring

In a header driven type packet switching system, all incoming and outgoing lines required for the system are divided into groups to constitute a two stage structure of incoming and outgoing modules, which are prepared for the respective incoming and outgoing line groups. In each incoming module, outgoing module and outgoing line, information is given to packets, and the data packets are successively transferred from the outgoing modules to the corresponding outgoing lines. Thus, the system can flexibly cope with an increase of the incoming lines and the number of calls.

Growing community of inventors

Kawasaki, Japan

Toshimasa Fukui