QLE2462 host Bus Adapter doesn't communicate with the switch!

i had place an order for Qty. #2 DELL FF340 QLE2462 host Bus Adapter 
to be installed in 2 servers, DELL PowerEdge R720 
the exist switch is Cisco and the fiber GBIC is Csico GLC-SX-MM= DOM (1/Gbps) 
both server is cannot connect to the switch! 
i try to make a connection between the two servers (between the two QLE2462) the servers are connected and working good 
but when i try to connect to the switches it doesn't work!