Fibre link down down on both ends

[mahesh18]

                   Hi everyone,

We have Fibre link down down from both ends.

From switch A goes to fibre box then to other fibre box then to switch B.

Switch A

Model:                 WS-X4418-GB-Gbic

  Type:                  1000BaseSX

Switch B

Model:                 WS-C3750G-24TS-1U

  Type:                  1000BaseSX SFP

Both sides are configured as trunk

Thanks

Mahesh