Optical path?

[rmellors]

The PRODML standard has a concept called 'Optical Path', which resembles our cable/fiber but is intended to capture the entire optical path during a single acquisition and would map to an OTDR measurement (which might be linked as an ancillary file). In this way the entire response could be captured including any splices or connections and could be validated by comparison with an OTDR measurement, which is usually conducted prior to data collection anyway. Perhaps something to think about.

[chad-earthscope]

This issue continued at FDSN/DAS-metadata#5