The Cisco 4-Port 40 Gigabit Ethernet Fiber Module with DFC4 is engineered to meet the growing demands for high-density 10 Gigabit and 40 Gigabit Ethernet transport in core networks. This module features four expansion slots, allowing each port to accept a 40 Gigabit Ethernet C Form-Factor Pluggable (CFP) optics module or be converted to four ports of 10 Gigabit Ethernet using a FourX adapter. This flexibility enables seamless transitions from 10 Gigabit to 40 Gigabit Ethernet without disruption, making it ideal for both campus and data center environments. The module is compatible with the Cisco Catalyst 6500 Supervisor Engine 2T, ensuring reliable performance and maximum efficiency in data networking applications.