JDSU 8126 LR SingleMode Long Haul OTDR Module (BC# 23577-L/T ). JDSU 8126 LR SingleMode 1310 / 1550nm Long Haul OTDR Module. JDSU 8126 LR Long Haul OTDR Module. SM OTDR Source With a 0.8 m event dead zone, it is now possible to qualify and troubleshoot problems in never before investigated sections of the fiber link.
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