S5500-28F-EI:

24 SFP Gigabit ports

8 10/100/1000 BASE-T Ethernet ports (Combo)

two extension slots.

Switching capacity (Full duplex)
 128 Gbps

Throughput
 95.2 Mpps

Management port
 1 console interface
 
Service ports
 24 Gigabit SFP ports, eight 10/100/1000 BASE-T Ethernet 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

Support up to 9 stacking devices