IBM Redbooks 2/4 Port Ethernet Expansion Card At-A-Glance Manual page 6

In BladeCenter H, the ports of CFFh cards are routed through the midplane to I/O bays 7, 8, 9, and 10, as
shown in Figure 3. The BladeCenter HT is similar in that the CFFh cards are also routed through the
midplane to I/O bays 7, 8, 9, and 10.
Figure 3. IBM BladeCenter H I/O topology showing the I/O paths from CFFh expansion cards
2/4 Port Ethernet Expansion Card (CFFh) for IBM BladeCenter 6