On Thu, Oct 31, 2013 at 7:24 PM, Matthew Petach <mpet...@netflight.com>wrote:
> On Thu, Oct 31, 2013 at 7:02 AM, Ray Soucy <r...@maine.edu> wrote: > > Was the unplanned L3 DF maintenance that took place on Tuesday a frantic > > removal of taps? :-) > No need for intrusive techniques such as direct taps: > > http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=1494884 > For shame.... you've sent in a link to some article behind a paywall, with some insane download fee. Which is an equivalent of hand-waving. They must be hiding their content, for fear that flaws be pointed out. "Of all the techniques, the bent fiber tap is the most easily deployed with > minimal risk of damage or detection. The paper quantifies the bend loss > required to > tap a signal propagating in a single mode fiber" > There will be some wavelengths of light, that may be on the cable, that bending won't get a useful signal from. Bending the cable sufficiently to break the total internal reflection property, and allow light to leak -- will generate power losses in the cable, that can be identified on an OTDR. > Matt > -- -JH
