Silicon Graphics Origin 3900, User Manual, Page: 221 / 292

N-brick
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N-brick
The 2U N-brick, which has four pairs of connectors (800 MBytes in each direction), can
be used to connect four graphics pipes to four IP53 node boards. A graphics pipe can also
connect to an IP53 node board via an IX-, PX-, or X-brick, however, the N-brick is the
most cost and space efficient solution when you do not require the additional I/O
capability.
External Components
The N-brick contains the following front-panel components (see Figure 13-9):
• L1 display. The L1 display is a 55.7 mm X 32 mm backlit liquid crystal display
(LCD) that displays system messages. It displays two lines with a maximum of 12
characters on each line.
• On/Off switch with LED. Press this button to turn on the N-brick internal
components. You can also turn on the N-brick internal components at a system
console or at the L2 controller touch display.
• Three LEDs:
– On/Off switch LED. This LED illuminates green when the N-brick internal
components are on.
– Service required LED. This LED illuminates orange to indicate that an item is
broken or not operating properly (for example, a fan is off), but the N-brick is
still operating.
– Failure LED. This LED illuminates red to indicate that a system failure has
occurred and the N-brick is not operating.
• Fans. Two hot-pluggable fans provide N+1 redundant cooling.