Please check out Dallas/Maxim app note 148. Gives a lot of insight into making 
things work and why they don't.

<http://pdfserv.maximintegrated.com/en/an/AN148.pdf>

Open stubs are a bad thing and cause reflections on the wire, disrupting 
communication. They can also act like antennas, picking up noise which could be 
the activity you see on the LED - but not sure what drives it since I couldn't 
find a schematic for the LinkUSB.

Paul

On Jan 28, 2014, at 3:52 AM, Colin Tinker <colin.tin...@gmail.com> wrote:

Eric

They are truly in series.  The LinkUSB light will come on dimly all the
time with a long cable with nothing attached to it and stay on all the
time dimly.  The light should only be on when there is traffic on the
network.

Colin


Colin,

Are your devices truly connected in series or are there some stubs?

If you have a power injector in the system I?m not sure why the LinkUSB light 
would dim at all.

Eric



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