Fujitsu Corporation

Shinichi Araya

Yoshihiro Watanabe

Yoshiharu Kato

Satoshi Kakuma

Masami Murayama

Shiro Uriu

Takashi Hatano

Kenichi Okabe

Yoshihiro Uchida

Mikio Nakayama

Jun Itoh

Yasuhiro Aso

Jin Abe

Naoyuki Izawa

Noriko Samejima

Eiji Ishioka

Hiroshi Nishida

Shigeru Sekine

Satoshi Esaka

Miyuki Kawataka

Yoshiyuki Karakawa

Fumio Hirase

Yasuhiro Nishikawa

Nobuyuki Tsutsui

Yoshihisa Tsuruta

Atsushi Kagawa

Atsuko Suzuki

Shouji Kohira

Hiromi Yamanaka

Kazutoshi Kobayashi

Akira Obata

Yasusi Kobayasi

Shinjirou Fujii

Sachiko Ishimoto

Takayuki Harada

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

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

An apparatus establishes a common signal channel with a flexible channel capacity for effective utilization of the total traffic capacity between two exchanges or stations which are interconnected by the common signal channel. A traffic detecting unit in one of the exchanges detects a traffic volume in the common signal channel between the exchanges. Based on the detected traffic volume, a channel capacity change determining unit determines whether a channel capacity to which the common signal channel is set needs to be changed or not and determines a new channel capacity to be established for the common signal channel if the channel capacity needs to be changed. If the channel capacity to which the common signal channel is set needs to be changed, a channel capacity change executing unit executes a change in the channel capacity to which the common signal channel is set based on the established new channel capacity.

Apparatus for establishing common signal channel

An apparatus for selecting a route in a packet-switched network where a plurality of candidate routes are available between a sending node and a receiving node. Total capacity calculation unit disposed in the sending node calculates the total channel capacity of each candidate route by summing up channel capacities of the inter-node links between the sending node and the receiving node. First selection unit chooses the candidate route(s) that exhibit the largest value of the total channel capacity. Uniformity calculation unit is activated when the first selection unit selected a plurality of candidate routes. The uniformity calculation unit calculates uniformity of each candidate route by evaluating the channel capacities of the inter-node links. The second selection unit chooses one of the candidate routes based on the calculated uniformity. This route will be used in packet transmission from the sending node to the receiving node.

Apparatus for selecting a route in a packet-switched communications

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Yokohama, Japan

Shinichi Araya