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Standard terminology for a dark fiber path?

What is the standard terminology for strands of dark fiber spliced together
to form a continuous path between points A and Z?

I have seen:

   - *fiber circuit* [but also seen used to denote a connection at the
   network layer over a physical fiber connection. This definition of circuit
   would include the dark fiber path, the transmitters and receivers and logic
   making up the data and network layers.]
   - *fiber loop *[ Does a loop define an electrical circuit with two
   physically separate positive and negative strands? In that case, is this a
   Bellhead remnant? ]

I am particularly interested in last mile systems, but I don't see any
reason that the term wouldn't be the same in the middle mile.


Fletcher Kittredge
8 Pomerleau Street
Biddeford, ME 04005-9457