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Remove the mating sleeve from between the reference cable and test cable, then take both units to opposite ends of the link.

Do NOT remove the cable from the light source port!

You may disconnect the cable from the OPM port, however. Just remember to put the dustcaps back on the OPM port and the power meter test cable connectors.

Also, please note that the light source will not be used for the OTDR portion of this procedure.