NC55-5504-FC is a NCS 5504 Fabric Card
The Cisco Network Convergence System (NCS) 5500 modular chassis series includes the Cisco NCS 5504 modular chassis, Cisco NCS 5508 modular chassis and the Cisco NCS 5516 modular chassis . The Cisco NCS 5504 supports up to four line cards, six switch fabric cards, two route processors, two system controllers, three fan trays, and four power supplies. The Cisco NCS 5508 supports up to eight line cards, six switch fabric cards, two route processors, two system controllers, three fan trays, and eight power supplies. The Cisco NCS 5516 supports up to 16 line cards, 6 switch fabric cards, 2 route processors, 2 system controllers, 3 fan trays, and 10 power supplies
