Yamaha Corporation

Hisashi Hirano

Kazushi Tamai

Ryota Hirose

Tsuneyuki Koikeda

A router controls transmission of packets over a plurality of networks. The router has a function of carrying out address translation of addresses added to the packets between private addresses and global addresses. A plurality of interfaces are each connected to a corresponding one of the plurality of networks. A first storage device stores data for the address translation, the data being set by a user. A second storage device stores information for applying the data stored in the first storage device to each of the plurality of interfaces, the information being set by the user. A control device prepares translation management information for each of the plurality of interfaces, based on the data stored in the first storage device and the information stored in the second storage device. A translation device is arranged in each of the plurality of interfaces, for carrying out the address translation of one of the addresses added to each packet of the packets, based on the translation management information.

Router

An optical disc reading device successively reads out data from an optical disc where the data are recorded on a packet-by-packet basis in such a manner that a link block is formed as a written-data gap between every adjoining packets. The data read out from the optical disc are decoded and subjected to an error detecting and correcting operation block by block. The blocks decoded and subjected to the error detecting and correcting operation are then sequentially stored into a data buffer. When a non-correctable error is found in a specific one of the blocks stored in the data buffer, the data reading section is controlled to continue the successive data readout from the optical disc if the specific block having the non-correctable error is a link block. But, if the specific block is not a link block, it is invalidated and the data reading section is controlled to stop the successive data readout from the optical disc. This arrangement effectively avoids degradation in reading performance even when an error occurs in a link block during advance readout of the data written on the packet-by-packet basis.

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Hamamatsu, Japan

Hisashi Hirano