GLYPH<SM590000> CPC drawer power infrastructure consists of the following components: – Three or four Power Supply Units (PSUs) that provide power to the CPC drawer. The  loss of one power supply leaves enough power to satisfy the drawer’s power  requirements (N+1 redundancy). The power supplies can be concurrently removed and  replaced (one at a time) – 7x 12v distribution point-of-load (POL) that plug in slots that divide the memory banks – 7x Voltage Regulator Modules that plug outside of the memory DIMMs – Two Power Control cards to control the five CPC fans at the front of the CPC drawer GLYPH<SM590000> Four SMP connectors that provide the CPC drawer to CPC drawer communication  (NUMA). The front view of the CPC drawer, which includes the cooling fans, FSP/OSC and bulk  (power) distribution cards (BDC), is shown in Figure 2-7. The rear view of a fully populated CPC Drawer is shown in Figure 2-8 on page 44. Dual port  I/O fanouts and ICA SR adapters are plugged in specific slots for best performance and  availability. Redundant power supplies and four SMP ports also are shown. Figure 2-7 Front view of the CPC drawer PPS ports Chapter 2. Central processor complex hardware components  43