MDI termination
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Posted by Roger on July 1, 2008, 3:19 pm
Please log in for more thread options are each terminated by a 50R resistor and then together to a 10nF capacitor to GND. However some applications connect the 2 resistors to Vcc (2.5V) as well. Can anyone explain why some configurations are like this and others aren't? Is it something specific to the magnetics? TIA, Rog. | ||||||||||||||||
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Posted by Rich Seifert on July 1, 2008, 7:56 pm
Please log in for more thread options It is not the magnetics; more likely, some implementations need a "pullup" to the higher voltage to provide power to the output driver through the terminating resistors. This is a function of the configuration of the output transistors in the PHY chip. -- Rich Seifert Networks and Communications Consulting 21885 Bear Creek Way (408) 395-5700 Los Gatos, CA 95033 (408) 228-0803 FAX Send replies to: usenet at richseifert dot com | ||||||||||||||||
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> are each terminated by a 50R resistor and then together to a 10nF capacitor
> to GND. However some applications connect the 2 resistors to Vcc (2.5V) as
> well. Can anyone explain why some configurations are like this and others
> aren't? Is it something specific to the magnetics?
>