Installation Instructions

Interoperation
40GBASE-ER4 and 40GBASE-LR4 QSFP+ transceivers can interoperate with a properly-
engineered link. It requires the cabling (channel) characteristics for 40GBASE-LR4 to be met, with
the exception of the maximum and minimum channel insertion loss values, as shown in the following
table, for the two link directions separately.
Direction Min. loss Max. loss Unit
40GBASE-LR4
transmitter to 40GBASE-
ER4 receiver
7.5 14.2 dB
40GBASE-ER4
transmitter to 40GBASE-
LR4 receiver
2.2 11 dB
QSFP+
May 2017 Installing Transceivers and Optical Components on VOSS 70
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