Combo interface 
A combo interface has one fiber SFP port and one 1000Base-T copper Ethernet port. These two ports 
share one port number and cannot work simultaneously. When you activate one port, the other port 
automatically shuts down.  
On the front panel of an 3600 v2 switch, the copper combo ports are marked in the port number + T 
format, and the fiber SFP combo ports are marked in the port number + S format. Figure 42 uses the 
3600-48 v2 SI Switch front panel as an example.  
Figure 42 Identify the combo ports on the 3600-48 v2 SI Switch front panel 
 
 
LEDs 
Table 13 LEDs at a glance 
LED Availabilit
System status LED  Entire series 
DC power LED 
PoE-capable 3600 v2 SI switches (model suffix PWR-SI), 3600 
v2 EI switches 
Port mode LED  Entire series 
Seven-segment LED  Entire series 
10/100Base-TX Ethernet port LED  Entire series 
1000Base-T Ethernet port LED  Entire series 
100Base-X SFP port LED  3600-24-SFP v2 EI Switch 
1000Base-X SFP port LED  Entire series 
 
System status LED 
The system status LED shows the operating status of the switch. 
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