On Nov 1, 2011, at 7:16 PM, Jack Countryman wrote:

> OK...mystery is at least partially solved.  If you go to system 
> preferences, choose sound, choose output, choose digital out and set the 
> volume off the bottom of the scale, then you get the light around the 
> output port.
> 


Yes, this is not an indicator, it's the laser that generated the modulated 
audio OPTICAL signal :-)

You see the same red on a fiber data port if you're incautious enough to look 
directly into it when it's on (a bad idea because it's a pretty powerful laser 
and will fry a spot on your retina)

-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs


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