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Why does "show media" sometimes show an RX power that is higher than the TX power at the other end of the link?

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TitleWhy does "show media" sometimes show an RX power that is higher than the TX power at the other end of the link?
Question
Why does "show media" sometimes show an RX power that is higher than the TX power at the other end of the link?

For example, this is from a VDX at one end of a 1G link.

 
VDX6740-1# show media interface tengigabitethernet 1/0/48 | include Power
TX Power 331.6 (uWatts)
RX Power 870.4 (uWatts)
VDX6740-1#

This is from the VDX at the other end of the link.
 
VDX6740-2# show media interface tengigabitethernet 2/0/48 | include Power
TX Power 298.0 (uWatts)
RX Power 1156.2 (uWatts)
VDX6740-2#
Environment
  • VDX6740
  • NOS 7.2.0d
  • 1000BASE-LX or 10GBASE-SX optics
Answer
For some optics types, TX power and RX power are measured in completely different manners. This can result in RX power higher than TX power at the other end of the link. This behavior is perfectly normal and not defective.
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