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    Cisco uses a proprietary cable pinout for their serial console cables.

    Note: Pinout or pin-out is a term used in electronics to describe how a cable is wired, or the function of each wire (pin) in a connector.

    Given below are the pinout details for both 9-pin and 25-pin Cisco connectors.

    9-pin Cisco Cable Cable Pinout

    Signal DB9F RJ45
    Receive Data 2 3
    Transmit Data 3 6
    Data Terminal Ready 4 7
    Ground 5 4
    Ground 5 5
    Data Set Ready 6 2
    Request to Send 7 8
    Clear to Send 8 1

    25-pin Cisco Cable Cable Pinout

    Signal DB25F RJ45
    Shield Ground 1  
    Transmit Data 2 6
    Receive Data 3 3
    Request to Send 4 8
    Clear to Send 5 1
    Data Set Ready 6 2
    Ground 7 4
    Ground 7 5
    Data Terminal Ready 20 7

    Physical Layer
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