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## 2.2.1 CPC drawer interconnect topology 

The point-to-point SMP connection topology for CPC drawers is shown in Figure 2-10. Each CPC drawer communicates directly to all of the other CPC drawers SC SCM (L4 cache) by using point-to-point links. 

<img src='content_image/1012812.jpg'>

The CPC drawers that are installed in Frame A and Frame B are populated from bottom to top. 

The order of CPC drawer installation is listed in Table 2-2. 

<img src='content_image/1012811.jpg'>

a. CPC3 and CPC4 are factory installed only (no field MES available) 

CPC drawer installation in the A frame is concurrent. Non-disruptive addition of CPC1 or CPC2 drawers is possible in the field (MES upgrade) if the reserve feature (FC 2271 or FC 2272) is present. Concurrent drawer repair requires a minimum of two drawers. 

