Brocade XBR-000139 XBR-000141 XBR-000158 XBR-000097 57-1000013-01 SFP 4.25G 850nm 550m Fibre Optic for Brocade DCX,5300,5100,300,Encryption,7800 Switch,optical transceivers are designed for 4.25Gb/s serial optical interfaces.Please read more on our web.