One of the questions I get asked about regarding optical cable measurements is: “Why don’t my OTDR and jacket length markings agree?”
The answer depends on the type of cable being made. In the old days (when you and I were a lot younger) the normal procedure was for a loose tube cable to be stranded and have a small amount of excess length in the tube.
Also, since the tube was following a helix around a central anti-buckling member, the overall fiber path was longer than the cable length.
While many of these cables are still being made and the excess length of fiber over jacket length is a function of the diameter of the core (larger core/bigger helix), there are now a number of different types of cable designs available that would invalidate that assumption.
READ THE FULL BLOG HERE: http://technicalhorsepowerconsulting.com/optical-cable-measurements-why-dont-otdr-and-jacket-length-markings-agree/
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