
Stack Installation Guide for AT-2552XS  L2 Data Center Switch
LEDs
Here are the descriptions of the switch’s LEDs.
SFP+ Slot LED Each SFP+ slot has one Link/Activity LED. The LED is triangular in shape. The triangle LED pointing up shows the status of the upper SFP+ slot while the triangle LED pointing down shows the status of the lower SFP+ slot. These SFP+ slot LEDs are shown in Figure 3.
LED Upper  | 
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  | L/A LED | ||
Upper SFP+  | 
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  | Lower SFP+  | 
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Slot  | 
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  | Slot  | ||
Figure 3. SFP+ Slot LEDs
The SFP+ slot LEDs are described in Table 2.
Table 2. SFP+ Slot LED
LED | State | Description | 
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  | Solid green  | The SFP+ transceiver has established a  | 
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  | link to a network device.  | 
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Link/Activity  | Flashing  | The SFP+ transceiver is receiving or  | 
  | green  | transmitting packets to a network device.  | 
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  | The SFP+ slot is empty or the SFP+  | 
  | Off  | transceiver has not established a link to a  | 
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  | network device.  | 
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  | 
  | 
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