In an inter-ring connection method and device interconnecting a plurality of RPR rings, an inter-ring connecting device (interconnecting station) determines whether or not an RPR frame received from one ring is a broadcast frame; and resets, when the RPR frame determined to be the broadcast frame is relayed to another ring, a ttl of the frame so that a predetermined point between the inter-ring connection device itself and another identical inter-ring connection device opposed within a ring to be relayed is a cleave point. Also, topology information of the one ring is transmitted to another ring; topology information of each ring is held in a topology database; and an RPR frame is relayed (unicasted) between the rings by referring to the topology database based on a destination address of the RPR frame.

 
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< Image pickup apparatus, control method thereof, control program thereof and storage medium, with movement of focus lens on basis of evaluation values extracted by long period scan upon failure of detection of peak position by short period scan

> Laser drive IC and optical transceiver using same

> Configuring programmable hardware on a device to communicate with cards based on ID information of the cards

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