Cisco Catalyst 6900 Series 4-Port 40 Gigabit Ethernet Fiber Module with DFC4XL – 4 – Expansion Slot – x Expansion Slots

Cisco Catalyst 6900 Series 8-Port 10 Gigabit Ethernet Fiber Module with DFC4 – 8 – X2 – x Expansion Slots

Cisco Expansion Module – 8 – X2 – x Expansion Slots