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Does it require any attenuators if I want to use the 10G LR transceivers in 5km?

Cisco SFP-10G-LR 10GBASE-LR SFP+ Module for SMF

SFP-10G-LR

Q
Does it require any attenuators if I want to use the 10G LR transceivers in 5km?
A
All tranceivers that operate at 10km and below do not need attenuators for any distance below 10km, because the laser strength is not too high for a receiver.