Matsushita Electric Works, Ltd.

Akira Matsuzaki

Junko Nakano

Masami Ohno

Koji Yamashita

Akira Yasuda

Junichi Suzuki

Hiroyoshi Yuasa

Tadashi Satake

Osamu Iijima

Satoru Suzaki

Hisataka Fujii

Mario Jose Cardona

Hideki Ikezawa

Yasuhiko Mizoguchi

A virtual LAN system forms a virtual group which is based on elements having physical attribute or logical attribute and constituting a virtual LAN, sets a client address and priority of the virtual group in a virtual group registration table, and allocates unicast and broadcast traffic bands in group units.

Virtual LAN system

An automatic ID assigning device for LAN instruments connected in a network assigns ID numbers from a master LAN instrument to respective slave LAN instruments connecting sequentially to the master LAN instrument. A first slave LAN instrument stores, as its own self ID, an ID number supplied in an ID assignment command signal supplied from the master LAN instruments through a data line connecting ports of respective slave LAN instruments. The slave LAN instrument returns an ID assignment acknowledging signal to the master LAN instrument and connects upper and lower ports of the slave LAN instrument together. The master LAN instrument updates a connecting number table of the ports of the slave IDs upon receipt of the assignment acknowledging signals and transmits a subsequent ID assigning command signal to another slave LAN instrument through the data line and through the connected ports of slave LAN instruments to which ID numbers have already been assigned. The upper and lower ports, i.e., the input and output administrative data lines, of the slave LAN instruments to which ID numbers have not yet been assigned are not connected to each other.

Automatic ID assigning device for network instruments

Growing community of inventors

Chiba, Japan

Akira Matsuzaki