Quadrics QsNetII Interconnect

Figure 3-4: QM501 Switch Card
Each of the 16 downlinks of the first stage of switches connects to a QM500
network adapter. The 4 uplinks of each Elite in the second stage of switches
connect to QM502 downlinks.
3.3.2 QM502 Switch Card
The QM502, shown in Figure 3-5, is a switch card containing four Elite switch
components. It provides 16 ports to implement the third stage in the fat tree
topology.
Figure 3-5: QM502 Switch Card
Depending on the interconnect configuration, Each QM502 provides the following
links:
• 4 downlinks only. The 4 uplinks from each of the 4 Elites in a QM502 switch
card are unused in a bounded configuration (less than 128 nodes).
• 4 downlinks and 4 uplinks. Each downlink connects to one of the four QM501
16-port switch cards housed in the node switch. The uplinks connect the node
switch to the top-level interconnects.
3.3.3 QM511C Switch Card
The QM511C, shown in Figure 3-6, is a switch card containing seven Elite switch
components. It provides 16 ports and implements all three stages in the fat tree
topology of a single interconnect, supporting a cluster of up to 128 nodes.
128-Port Interconnect Modules 3-7