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LT4293 Recommended for New Designs
The LT4293 is an LTPoE++/IEEE 802.3af/at/bt-compliant powered device (PD) interface controller. The T2P output distinguishes between LTPoE++ and IEEE 802...
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LT4293 on Analog.com

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Ethernet Transformer LAN connection for PD Device With LT4293

		
	
				

			

									
					    archi
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 22, 2024 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the pin arrangement for the spare pairs (4-5 and 7-8) on the ETH J1 connector and T1 Transformer in the DEMO Circuit 2911A for the LT4293 controller. The final answer confirmed that the pin exchange (5-4 and 8-7) is functionally equivalent to a linear sequence. The accompanying answer provided a schematic for reference.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  LT4293  
    
    		        		    		    
    
		    		    
		    			
    
			    
    

    Good morning everyone community,
    

    

     
    

    I'm trying to use your LT4293 controller soon and was wondering on page 2 of the DEMO Circuit 2911A:
    

     
    

    why from the ETH J1 connector the Spare pair PINs 4-5 and 7-8 are exchanged on the T1 Transformer 5-4 and 8-7 and the same at the output???  
    

     
    

    I have never seen it on other PoE schematics or on PSE Controllers, it is not better to connect the last Pins in a linear sequence 4-5 7-8

    Thank you very much for the Answers and suggestions.
    
			
    
			
									
		                             
                        

    
    
                                            
                 PoE Powered Device (PD)
                
                                                    
                 Datasheet/Specs
                
                                                    
                 4PPoE
                
                                                    
                 LT4293
                
                                                    
                 LAN Transformer
                
                                        
                                            
                
                
                                
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