Cisco 4-Port 10 Gigabit Ethernet Interface Module - Expansion module - 10 GigE - 10GBase-X - 4 ports - refurbished - for P/N: CRS-16/S/ CRS-16-LCC/ CRS-16-LCC/M/ CRS-4/S/ CRS-4-CH=/ CRS-8-LCC=/ CRS-8-LCC-RF