The Server Modules (blades) use HyperTransport links to provide PCI Express I/O connectivity to the Network Express Modules (NEMs), and in the Sun Blade 8000 Chassis also to the PCI Express ExpressModules (EMs).
Up to four NEMs can be installed in a Sun Blade 8000 Chassis, numbered 0-3, with 0 being the bottom NEM slot and 3 the top NEM slot. Up to two NEMs can be installed in a Sun Blade 8000 P Chassis, numbered 0-1, with 0 being the bottom NEM slot and 1 the top NEM slot.
Each NEM provides 10 individual Gigabit Ethernet NICs, one for each blade, which are numbered 0-9 right-to-left as viewed from the back of the chassis. Each NIC has two external network ports. For each pair of external ports (for each blade), the top is port 0 and the bottom is port 1.
EMs are supported only in the Sun Blade 8000 Chassis. Up to 20 EMs can be installed in a chassis, with two EM slots assigned to each blade. The blade to EM connections are logically defined by the midplane as shown in the following table.