The 10Gig optic works at 10Gig speed only. There are ways to create two 1 Gig out of a 10Gig port using Twingig converters, but your device has to support it. You would also need 1 Gig optics.
What product are you having question? X2? XENPAK? SFP+? And what platform?
Regards,
jerry
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