Table 9 describes the 
Table 9. 450-1SR /  450-1SX  MDA Description
Item  | Label | Description  | 
  | 
  | 
  | 
1  | Link  | Communication link LEDs (green):  | 
  | 
  | On: Valid communications link.  | 
  | 
  | Off: The communications link  | 
  | 
  | connection is bad or there is no  | 
  | 
  | connection to this port.  | 
  | 
  | Blinking: The corresponding port is  | 
  | 
  | management disabled.  | 
2  | Phy  | Phy status LEDs (green):  | 
  | (or)  | 
  | 
  | Phy Select  | 
  | 
  | 
  | On: The corresponding Phy port is  | 
  | 
  | active.  | 
  | 
  | Off: The corresponding Phy port is in  | 
  | 
  | backup mode or there is no connection  | 
  | 
  | to this port.  | 
3  | Activity  | Port activity LEDs (green):  | 
  | 
  | Blinking: Indicates network activity  | 
  | 
  | level for the corresponding port. A high  | 
  | 
  | level of network activity can cause  | 
  | 
  | LEDs to appear to be on continuously.  | 
4  | 
  | |
  | 
  | 
  | 
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