HD audio cables

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vahid1368

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hi please see photo
Why in some motherboard hd audio cables... pins two and four are connected ??? Is it needed?
photo_2021-05-07_04-22-06.webp
 
Computer motherboards often provide a connector to bring microphone and headphone signals to the computer's front panel. Intel provides a specification for that header, but the signal assignments are different for AC'97 and HD Audio headers.[10]

The pin assignments for the AC'97 and HD Audio connectors are:[10]

en.wikipedia.org

Intel High Definition Audio - Wikipedia

en.wikipedia.org en.wikipedia.org
 
muckshifter said:
Computer motherboards often provide a connector to bring microphone and headphone signals to the computer's front panel. Intel provides a specification for that header, but the signal assignments are different for AC'97 and HD Audio headers.[10]

The pin assignments for the AC'97 and HD Audio connectors are:[10]

en.wikipedia.org

Intel High Definition Audio - Wikipedia

en.wikipedia.org en.wikipedia.org
Click to expand...
Thank you for your guidance. Therefore, it can be concluded that in cable Hd audio..., pins two and four should be connected with a short wire. it's true?
 
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