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Need help with SFP

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We have configured 11 switch CISCO CATALYST 2960-S (2 GBIC PORTS )and 2960-L (4 GBIC PORTS), but there is no conection (no link) over the optical fiber between two SFP GLC-SX-SM. I have searched information in the page of CISCO, but nothing about troubles with these GBICs.

The jumper and FO (single mode) was tested and approved.

Is it posible, that I must configure this ports first?

Can you help me, please?. Thanks.

Best Regards,

Manuel Hernández