Fujitsu Corporation

Naoyuki Miyamoto

Tetsuo Tachibana

Tetsuo Nishino

Osamu Isono

Ryuji Hyodo

Katsumi Oomuro

Tsuyoshi Yoneta

A data transfer system comprises a first communication device, a second communication device connected thereto via a first line, a third communication device connected thereto via a second line, and a fourth communication device connected thereto via a third line. The first communication device has a data transmission condition reception section for receiving a data transmission condition value for the up channel of the first line transmitted by the second communication device and a data transmission section for enabling data to be transmitted according to the data transmission condition received by the data transmission condition reception section.

System and method for transferring data

A network is constructed by connecting trunk circuits through a trunk in an exchange in which the trunk circuit connects with a trunk, an extension circuit connects with a terminal, and the trunk circuit is connected to the extension circuit by a path switch controlled by a calling processor and by connecting the terminals to the extension circuit. Control information is transmitted and received by utilizing a channel of a not-in-service trunk up to a time before receiving a response of a remote party to a trunk connection call. The control information is transmitted and received by utilizing a no-signal area in the trunk from a time after receiving the response of the remote party to the trunk connection call to an end-of-service time. The control information on the connection call between two exchanges and the control information on an operational management maintenance of the exchanges are thereby transmitted and received.

Method of and apparatus for signalling between nodes in network

A synchronization circuit for ATM cells transferred in an ATM communication system, wherein the synchronization circuit receives and holds in a bit serial manner the input bit trains constituting the received ATM cells by a shift register unit, performs a CRC operation in a bit serial manner on the held input bit trains by a continuous CRC arithmetic unit in accordance with a simplified CRC operation process different from the usual CRC operation process, and performs the necessary synchronization control upon receiving the CRC arithmetic operation result at a synchronization control unit, thereby enabling CRC arithmetic operations to be performed continuously and by simple hardware on the headers in the ATM cells.

Synchronization circuit

A network system includes a plurality of terminals classified into a plurality of groups, a network for selectively connecting the plurality of terminals to each other, and a control part for receiving a call indicating one of the groups from a source terminal which is one of the plurality of terminals and for coupling, through the network, the source terminal to a destination terminal which is one terminal included in one of the groups which has an attribute identical to that of the source terminal.

Network system having different attributes of terminal equipment devices

An ATM communication system including an ATM switching network which includes a plurality of ATM exchanges and controls exchanges among a plurality of terminal equipment and a management apparatus which manages the traffic in the ATM switching network; the ATM switching network including a notifying unit which notifies the terminal equipment of the allocable bandwidth which can be used in accordance with the amount of traffic in the ATM switching network; when the notified allocable bandwidth is a bandwidth which can be used for their communication, the terminal equipment starting the communication in the range of that bandwidth.

Growing community of inventors

Tama, Japan

Naoyuki Miyamoto