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Last Post 26 Feb 2004 06:52 PM by  rwalters@qualcomm.com
Wired lan not electrically isolated?
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rwalters@qualcomm.com
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24 Feb 2004 06:37 PM
    Has anyone else noticed that the wired lan is not electrically isolated on the LH7A400 ZOOM SDK? The reference schematic for the 91C111 shows an isolation transformer between the RJ-45 connector and the IC. There is no such transformer on the ZOOM SDK.

    It also looks like the line impedence is not matched. The impedence for RJ-45 twisted pair is 75 ohms. The terminators used on the ZOOM SDK are 50 ohms.
    picman@uk2.net
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    26 Feb 2004 06:05 PM
    The Pulse RJ45 connector on the board has the transformer built in... check pulse's website... there is no need for an external transformer.
    rwalters@qualcomm.com
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    26 Feb 2004 06:52 PM
    Cool -- good to know! Thanks
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