Dell PowerEdge M1000e Configuration Manual page 49

Pass-through Modules
Ethernet Pass-through Module
The Ethernet pass-through module supports 10/100/1000 Mb connections,
and provides a direct connection between the optional internal Ethernet
mezzanine card in the blade or the integrated LOMs in the blade, and an
external Ethernet device (see Figure 3-6). The Ethernet pass-through
modules are hot-pluggable and may be installed in any of the three fabrics.
NOTE:
No configuration is required for this module.
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Configuration Guide