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LTC4266 LINK FAIL



		

			

									
					    MIKE-NOH
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 17, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTC4266AIUHF  
    
    		        		    		    	
			
    Dear Sir,
    

    

    The LTC4266 controller does not work properly, so the PD is not properly supplied with power, or PoE Link does not attach even if the power is supplied.

    The peculiarity is that if the controller is software reset, it will operate normally again.(Approximately once every 200 times)
    

    

    Could you advice me about issue? it is software or H/W issue?
    

    

    Application : DAS Repeater Digital Board
    

    

    Best Regards,
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on May 17, 2022 6:28 PM
            
            
					
      
	
      

		
		
      
					
      "Link" is not a term used in PoE.  Have your read the LTC4266 datasheet?  Please refer to the document for an overview of the detection and power on of a device.  What you describe does not indicate the LTC4266 is working properly; it could very well be avoiding power to a faulty or incompatible PD which is what a valid PSE should do.
      

      1) Have you tried using an alternate PD, preferably one that is Ethernet Alliance (EA) certified?
      

      2) Are you running the PSE in AUTO pin high mode?  This mode is useful to determine if the hardware is correct.  If a valid PD is powering up properly, then a software configured system could be incorrectly configured via software.
      

      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on May 17, 2022 6:28 PM
            
            
					
      
	
      

		
		
      
					
      "Link" is not a term used in PoE.  Have your read the LTC4266 datasheet?  Please refer to the document for an overview of the detection and power on of a device.  What you describe does not indicate the LTC4266 is working properly; it could very well be avoiding power to a faulty or incompatible PD which is what a valid PSE should do.
      

      1) Have you tried using an alternate PD, preferably one that is Ethernet Alliance (EA) certified?
      

      2) Are you running the PSE in AUTO pin high mode?  This mode is useful to determine if the hardware is correct.  If a valid PD is powering up properly, then a software configured system could be incorrectly configured via software.
      

      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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