You can install the XL card in the upper PCI slot in the IDS-4250 series appliances. The XL card accelerates the performance of the IDS-4250 up to 1 Gbps. You can use an MTRJ cable (part number CAB-MTRJ-SC-MM-3M=) to connect the fiber port on the XL card to the switch on the network. You can order this cable when you order the XL card.