Amber LED from green+yellow

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buenos

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Hi

Someone told me that the Ethernet ports' amber LED is a green/yellow dual LED that they reverse polarity at few kHz to turn both on a little bit and together generate a combined color.
Is it true?
I have not seen any documents or datasheets stating that.
 

If that were true it would be Red & Green back to back. to make it try color and harder to make.
All the ones I have seen are bicolor with 3 or 4 pads Green-Amber
 

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