Fujitsu Corporation

Fumio Hirase

Yoshihiro Watanabe

Yoshiharu Kato

Satoshi Kakuma

Shiro Uriu

Masami Murayama

Takashi Hatano

Yoshihiro Uchida

Kenichi Okabe

Mikio Nakayama

Jun Itoh

Yasuhiro Aso

Jin Abe

Naoyuki Izawa

Hiroshi Nishida

Noriko Samejima

Eiji Ishioka

Shigeru Sekine

Satoshi Esaka

Miyuki Kawataka

Yoshiyuki Karakawa

Yasuhiro Nishikawa

Shinichi Araya

Nobuyuki Tsutsui

Atsushi Kagawa

Atsuko Suzuki

Shouji Kohira

Hiromi Yamanaka

Yoshihisa Tsuruta

Yasusi Kobayasi

Eiichiro Takahashi

Yasusi Kobayashi

A switch station including an ATM switch; a memory storing control data for operations of the switch station; an intra-station device, accommodating a subscriber line, performing communication operation on subscriber ATM cell; a control processor generating control information in link access protocol (LAP) format; and an interface unit converting LAP control information into ATM cell to the intra-station device through the ATM switch, wherein the control information is communicated according to LAP, the intra-station device receives the control information and transmits a direct memory access request to obtain control data stored in the memory, the interface unit obtains and converts the data format of the control data into ATM cell to transmit to the intra-station device through the switch, and the intra-station device performs the communication operation on the subscriber ATM cell based on the control data received through the switch.

Intra-station control system for connectionless communications system

A resource usage of a switching section can be reduced and operations for connection can be facilitated in high speed even if a failure occurs on the switching section by a line switching method. The line switching method in an asynchronous transfer mode exchange including a line concentration and distribution device, to which a subscriber circuit for accommodating a plurality of subscribers, is connected and a switching section, includes the steps of comparing information for identifying a path of a subscriber's cell with information registered in a monitor table, detecting that a first subscriber circuit for accommodating a called subscriber is connected to a same line concentration and distribution device to which a second subscriber circuit for accommodating calling subscriber is connected, and looping back and connecting the call sent from the calling subscriber to the called subscriber without passing through the switching section.

Line switching method and asynchronous transfer mode (ATM) system using the same

The quality and performance of the connectionless communications system are improved. When a BOM is received, the destination address DA of the L3-PDU stored in the payload of the BOM is retrieved, and the tag information is obtained from the DA (S,). The output message identifier MID is reserved (S,), and the tag information and output MID are assigned to the BOM (S,). Then, the tag information and output MID are written to the table. When a COM is received, the tag information and output MID are retrieved using the MID of the COM as a key, and the information is provided for the COM (S,and S,). When an EOM is received, the tag information and output MID are retrieved using the MID of the EOM as a key, and the information is provided for the EOM (S,and S,). Then, the output MID is released (S,).

Connectionless communications system, its test method, and intra-station control system

A method for establishing bidirectional connections and multiple connections performed by an ATM switching device is disclosed, and the method may include the steps of recognizing a connection request message sent from one calling subscriber, including information concerning other n-1 called subscribers in the asynchronous transfer mode switching device transmitting the connection request message to the n-1 called subscribers, and transmitting a response to the calling subscriber from the n-1 called subscribers from the asynchronous transfer mode switching device; and establishing bidirectional connections between the calling subscriber and the called subscribers.

Method for forming multiple bidirectional connections for use in

In one embodiment of a multi-connection management method, a management area is prepared for each of the interfaces. A call control memory stores the management information of a leaf interface, statuses of connections, leaf interface information and link information. A whole leaf interface management area is stored with the link information of the leaf management areas. The leaf management area for each interface is stored with the information of the corresponding interface and the link information. In another embodiment, connection status for a fixed-connection communication of a multicast is confirmed. This includes a communication controller that receives a status confirmation demand message sent by terminals and demands a multicast server for information collection, if the message is the status confirmation demand message which is effective for the protocol regulations. If the response information for the status of each line accommodator, which is collected and gathered by the multicast server, is returned from the multicast server to the communication control as a result of the information collection demand, the communication controller edits a connection status notice message on the basis of the response information and sends a connection notice message to the multicast server to return it to the terminals through the line accommodators.

Multi-connection management method and apparatus for switch system

Growing community of inventors

Kawasaki, Japan

Fumio Hirase