ethernet communication problem


i am using a wolf bl2610 connected to an wireless ethernet bridge.
A pc needs to comm with it through an AP.

when there is no communication the LNK led is green and the ethernet antenne also indicates that there is a link with a device, But if a send an ping cmd from the pc the link disapearse at the time the ack turns orange.
First i thought this was because the powersupply of the antenne was not ok but this is not the problem.

could anybody help