Chapter 2. Architectural and technical overview
41
The processor book VPD card holds the VPD card and SVPD (CoD) for processor book
information. Routes sense and control signals pass between the DCAs and processor
book planar (DIMM LED Control). The VPS card plugs into processor book planar and the
node power distribution planar
Two Distributed Converter Assemblies (DCAs) located at the back of each processor
book.
Four RIO-2 or 12x I/O hub adapter slots (two wide and two narrow) are located at the front
of the processor book.
Two embedded Node Controller service processor cards (NC) are located in the front of
the processor book. The node controller cards communicate to the HMC via the Bulk
Power Hub (BPH) and are connected to both front and rear Ethernet ports on the BPH.
The layout of a processor book and its components is shown in Figure 2-4.
Figure 2-4 processor book cards layout
Processor book placement
Up to eight processor books can reside in the CEC cage. The processor books slide into the
mid-plane card, which is located in the middle of the CEC cage. Support is provided for up to
four books on top and four books on the bottom of the mid-plane. The processor books are
installed in a specific sequence as listed in Table 2-1 on page 42.
Two oscillator (system clock) cards are also connected to the mid-plane. One oscillator card
operates as the primary and the other as a backup. In case the primary oscillator would fail,
the backup card detects the failure and continues to provide the clock signal so that no outage
occurs due to an oscillator failure.
2x NC
8xDIMM
2x DCA
Node power distribution planar
SVPD Card
4x GX adapters
Internode
connectors
4x MCMs
24 xDIMM
4 xLGA
Air Flow Sensor
2x NC
8xDIMM
2x DCA
Node power distribution planar
SVPD Card
4x GX adapters
Internode
connectors
4x MCMs
24 xDIMM
4 xLGA
Air Flow Sensor
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