Fujitsu Corporation

Hiroshi Ishiwata

Masakazu Sato

Shiro Uriu

Kenichi Okabe

Junichi Kawaguchi

Kazumasa Sonoda

Hiroko Yoshino

A switching system in an ATM switching system accommodating an ABR is constructed of an individual units connected to a transmitting terminal or a receiving terminal to implement an efficient bandwidth authorization, and a plurality of intra-system relay devices having transmission allowed rate calculating units. In this switching system, there are separated a transfer of a management cell between the transmitting terminal or the receiving terminal and the individual unit and a transfer of the management cell between the plurality of intra-system relay devices.

Communication controlling apparatus

An ATM switching system concentrates cell streams, which are output by respective ones of a plurality of line interfaces, by a concentrator, enters a resulting cell stream into an ATM switch unit, deconcentrates cells, which have been switched by the ATM switch unit, by a deconcentrator on a per line interface basis and sends the cells to lines. Each line interface converts a VPI/VCI included in the header of a cell that has entered from a line to an internal cell address having a number of bits smaller than the number of bits of the VPI/VCI. Each unit in the ATM switching system performs management of various data and controls cell switching based upon a converted cell address without relying upon the VPI/VCI. The line interface restores an internal cell address, which is included in the header of a cell that enters from the side of the ATM switch, to the VPI/VCI and sends the cell to a line.

ATM switching system

Growing community of inventors

Kawasaki, Japan

Hiroshi Ishiwata