On Thu, Jun 16, 2016 at 10:56 AM, This 1s <[1]this1s@mailbox.org>
   wrote:

   Is internet cable in house a hot mic?

   I doubt it.  Sounds like this needs some pretty special equipment at
   the end of the fiber.   Also not clear that it can be used concurrently
   with data transmission over the fiber.
   Could be that the company is lighting up unused fiber?  Cheap way to
   get audio surveillance along a vast stretch of pipeline that happens to
   have some dark fiber sitting beside it.

References

   1. mailto:this1s@mailbox.org