S5500-52C-PWR-EI:

 48 10/100/1000 BASE-T Ethernet PoE ports

 4 SFP Gigabit ports (Combo) 

 Two extension slots.

 POE Support

48 10/100/1000 BASE-T Ethernet ports, 4 Gigabit SFP ports (Combo), 4 Gigabit SFP ports (Combo)

 
Extension slot
 2 extension slots
 
Optional interface modules
 1-port 10GE XFP interface module

2-port 10GE XFP interface module

2-port 10GE CX4 interface module

2-port SFP interface module
 
Stacking
 Support IRF2

Support up to 9 stacking devices
 
POE (Power Of Ethernet)
 Yes