Connect a cisco Catalyst 3750 switch to an Enterasys Matrix switch

I try to connect with fiber two switches. One Cisco Catalyst 3750 with 12 SFP's and a Enterasys Matrix with several modules.

I install a 1000Base LX GBIC in the CIsco, an i connect it to an SC type connector in the Matrix switch, but they don't link. I try to connect the catalyst 3750 to another catalyst 500 and they link perfectly, so there is no problem with fiber optic cable.

Is there any special configuration needed in the CIsco, or in the Matrix?

What could be the problem?

Thanks
llandajuelaAsked:
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Freya28Connect With a Mentor Commented:
you should have at least a link light.  is the Enterasys a gig switch or 10/100?  if it is a gig switch then hard code the interface on both switches to 1000 and full.  if the enterasys is 10/100 then hard code both switch interfaces to 100 full. and on the cisco side on the connecting interface do a "mdix auto"
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