Feature set Model Total 10/100/1000 ethernet ports Uplinks Default ac power supply rating Default poe power Stack power Upgradable Lanbase layer 2 Ws-c3750x-24t-l 24 Modular 4x1g 2x10g 350w with dual modular slots Available with upgrade toip base Ws-c3750x-48t-l 48 Upgradable Ipbase layer 3 Ws-c3750x-24t-s 24 Yes Ws-c3750x-48t-s 48 Upgradable Lanbase layer 2 Ws-c3750x-24p-l 24 poe+ Modular 4x1g 2x10g 715w with dual modular slots 370w Available with upgrade toip base Ws-c3750x-48p-l 48 poe+ Ws-c3750x-48pf-l 48 poe+ 1100w with dual modular slots 740w Upgradable ip base layer 3 Ws-c3750x-24p-s 24 poe+ 715w with dual modular slots 370w Yes Ws-c3750x-48p-s 48 poe+ Ws-c3750x-48pf-s 48 poe+ 1100w with dual modular slots 740w. Cisco original sealed packing