Quadrics QsNetII Interconnect

3.2.3.2.1 Node-Level Interconnect (NLI)
Node level interconnects use the 3X-CS5A0-AF midplane. 4 QM502 switch cards
are inserted in slots 0 through 3 in the rear of the enclosure. 4 QM501 switch cards
are inserted in slots 4 through 7 in the front of the enclosure. Each of the QM501
cards has 16 link ports, making 64 ports in a fully populated enclosure. The port
numbers on the QM501 and QM502 cards start at the top and are numbered 0-15.
Node level interconnects use the 3X-CS5A0-AF midplane. 4 QM502 switch cards
are inserted in slots 0 through 3 in the rear of the enclosure. 4 QM501 switch cards
are inserted in slots 4 through 7 in the front of the enclosure. Each of the QM501
cards has 16 link ports, making 64 ports in a fully populated enclosure. The port
numbers on the QM501 and QM502 cards start at the top and are numbered 0-15.
You must connect a shielded CAT–V clock distribution cable must be connected
between both Ctrl A and Ctrl B primary inputs to the appropriate the QM580 clock
distribution box to ensure that the federated interconnects operate at a common
frequency. The Ctrl A and Ctrl B secondary inputs can be attached to a second
QM580 to provide backup in case of failure. The cabling tables describe the clock
distribution network.
3.2.3.2.2 Reduced Bandwidth Federated Configurations
HP Cluster Platforms can be configured to provide a lower bandwidth interconnect
network at lower cost to the customer. In such configurations, fewer QM502 cards
are installed in the front slots of the node-level interconnect.
3.2.3.2.3 Top-Level Interconnect (TLI)
Table 3-2 shows the configuration rules for top-level interconnects.
Table 3-2: TLI Configuration Rules
Nodes
Card Type
Midplane
129-256
QM502 3X-CM5A0-AN
257-1024
QM501 3X-CM5A0-AN
All slots (front and rear) are populated with the specified card type, depending on
the number of nodes in the cluster. Link cables connect the switch cards in the
top-level interconnects to the QM502 cards in the front slots of the node-level
interconnects.
3.3 Switch Cards
The following sections describe the three switch card options, depending on the
interconnect configuration. Cards are keyed to prevent incorrect insertion into
midplanes that are not designed to receive the card.
3.3.1 QM501 Switch Card
The QM501, shown in Figure 3-4, is a network switch card built from eight Elite
switch components. These eight switches are arranged in a 2-stage, fat tree
topology to produce a 16-way switch.
3-6 128-Port Interconnect Modules