Dell POWEREDGE M915 - Manual (Page 85)

About Your System 85
Dell 10 GbE KR Pass-Through I/O Module
The 10 GbE KR pass-through module supports 10 Gb connections and
provides a direct connection between the optional internal Ethernet KR
mezzanine card or KR network daughter card in the blade and an external
Ethernet device. This module has 16 external SFP+ ports on the front panel
and sixteen 10 GbE KR internal ports through the backplane. This module
enables you to use optical SFP+ (short reach or long reach) and direct-attached
copper (DCA) SFP+ modules.
The Ethernet pass-through module is hot-swappable and may be installed in
Fabric A, B, or C. The pass-through module does not support 1G mezzanine
or network daughter cards in blades.