65 
Chassis 
Console 
ports 
10/100/1000Base-T 
auto-sensing Ethernet 
ports 
1000Base-X 
SFP ports 
Interafce 
card slots 
5120-48G EI (2 slots) 
5120-48G EI TAA (2 slots) 
1 48  4  2 
5120-48G-PoE+ EI (2 slots) 
5120-48G-PoE+ EI TAA (2 slots) 
1 48, PoE+   4  2 
5120-8G SI  1  8  1  N/A 
5120-16G SI  1  16  4  N/A 
5120-24G SI  1  24  4  N/A 
5120-8G-PoE+ SI  1  8, PoE+  1  N/A 
5120-8G-PPoE+ SI  1  8, PPoE+  1  N/A 
5120-24G-PoE+ SI  1  24, PoE+  4  N/A 
5120-24G-PPoE+ SI  1  24, PPoE+  4  N/A 
5120-48G SI  1  48  4  N/A 
 
  NOTE: 
On a 5120 EI switch, the last four 10/100/1000Base-T Ethernet ports and the four SFP ports are 
copper/fiber combo ports in pairs, as shown in Table 17. They form four combo interfaces. When o
ne 
port in a pair is activated, the other port automatically shuts down.  
 
Environmental specifications 
Chassis  Operating temperature  Relative humidity 
All chassis  0°C to 45°C (32°F to 113°F)  10% to 90%, noncondensing 
 
Power specifications 
Power input types 
Chassis  AC-input power receptacle  RPS receptacle  
All 5120 EI chassis, 
5120-24G-PoE+ SI 
1 1 
All 5120 SI chassis but the 
5120-24G-PoE+ SI 
1 N/A 
 
The RPS can supply power to your switch when the AC power line fails or cannot supply sufficient power.