Fujitsu Corporation

Kazuo Sakagawa

Ichiro Iida

Yoshihiro Watanabe

Hideo Suzuki

Toshio Soumiya

Masafumi Katoh

Jun Ogawa

Akira Chugo

Satoshi Nojima

Teruhisa Nakamura

A originating terminal sends an ATM address interrogation request to a server if the ATM address of another party's terminal is unknown at the time of communication. Upon receiving the ATM address interrogation request from the terminal, the server refers to an ATM address table, searches the table for an ATM address corresponding to a protocol address contained in the interrogation request and notifies the originating terminal of this ATM address. If an ATM address corresponding to the protocol address has not been registered in the ATM address table, the server transfers (broadcasts) the ATM address interrogation request to all terminals. The server notifies the originating terminal of an ATM address obtained by an answer in response to this interrogation request and registers the ATM address in the ATM address table.

System for server obtaining terminal address via searching address table or via broadcasting to all terminals through exchange in response to terminal address interrogation request

An apparatus and a method for transferring a packet flow having a plurality of packets in a communication network which includes plural subnetworks, first and second end systems connected to the respective subnetworks and a transit system for relaying the packet and a message between the first and second end systems through a default route, where the packet flow is forwarded from the first end system to the second end system or to a terminal connected to the second end system, in the first end system, determines it by collating the packet with a predetermined criterion whether to forward the packet flow through a shortcut path bypassing the default route and in dependence upon the determining, sends to the second end system through the default route, a request message requesting to set the shortcut path, along with an address of the first end system; in the second end system, requests the communication network to set the shortcut path between the first and second end systems in accordance with the request message; and in the first and second end systems, forwards the packet flow through the shortcut path.

Apparatus and a method for transferring a packet flow in a communication network

System for server obtaining terminal address via searching address table

The present invention is designed such that the communication quality of a currently connected normal call is deteriorated and the transmission of the normal call is delayed in a network when an emergent call is set. As a result, the required bandwidth of the emergent call is successfully reserved. Furthermore, the present invention is designed such that a deteriorated normal call is detoured to a detour circuit to improve the communication quality of the normal call. In the detouring process, one or more detour circuits are managed for each normal call so that the possibility of a successful detour to a detour circuit can be raised. Additionally, in the normal call detouring process, a plurality of detour circuits guarantee a normal call its communication quality even if a single detour circuit is not enough to meet the required bandwidth of a normal call.

Call accommodation system containing emergent calls and normal calls

A switching node in a label multiplexing type switching network includes a switch for selectively coupling input logical communications paths and output logical communications paths with each other, m permanent logical communications paths being included in the input logical communications paths where m is an integer larger than or equal to 1, n permanent logical communications paths being included in the output logical communications paths where n is an integer larger than or equal to 1. The switch node includes a call control unit for receiving connection-oriented type information through any of the input logical communications paths and for controlling the switch so that the connection-oriented type information are selectively transferred to the output logical communications paths via the switch on the basis of routing address information related to the connection-oriented type information. The switch node comprises a routing unit for receiving connectionless type information through any of the m logical communications paths and for controlling the switch so that the connectionless type information are selectively transferred to the n permanent logical communications paths via the switch on the basis of routing address information related to the connectionless type information.

Switching node in label multiplexing type switching network

A data transfer system having a transfer discrimination circuit for discriminating the type of data transfer between an input/output channel device and I/O devices for a computer includes a transfer discrimination circuit. This circuit includes a edge detection unit operating in response to a tag signal supplied to the edge detection unit for detecting the trailing edge of the tag signal after a leading edge of the tag signal has passed. The edge detection unit having a leading edge detector, a trailing edge detector, a storage element, and logic gate circuits. A timing unit is included operating in response to the output of the edge detection unit for counting a predetermined time, along with a discrimination storage unit operating in response to the output of the timing unit for delivering an output indicating an interlock data transfer or an output indicating a data streaming feature data transfer.

Growing community of inventors

Kawasaki, Japan

Kazuo Sakagawa