Chapter 2. Architecture and technical overview 61
The star fabric bus topology that connects the processors together in separate drawers is
contained on SMP flex cables that are routed external to the drawers. These flex cables
attach directly to the CPU cards at the front of the drawer and are routed behind the front
covers of the drawers.
The SMP and flexible service processor (FSP) cable features described in Table 2-9 are
required to connect the processors together when system configuration is made of
two-drawer, three-drawer, or four-drawer system enclosures.
Table 2-9 Required flex cables feature codes
The cables are designed to support hot-addition of system enclosure up to the maximum
scalability. When adding a new drawer, existing cables remain in place and new cables are
added. The only exception is for cable 3711 or 3715, which is replaced when growing from a
two-drawer to three-drawer configuration.
The cables are also designed to allow the concurrent maintenance of the Power 770 or Power
780 in case the IBM service representative needs to extract a system enclosure from the
rack. The design of the flexible cables allows each system enclosure to be disconnected
without any impact on the other drawers.
Enclosure MMB/MMC SMP cables MMD/MHD SMP cables FSP cables
Two-drawer 3711, 3712 3715, 3716 3671
Three-drawer 3712, 3713 3716, 3717 3671, 3672
Four-drawer 3712, 3713, 3714 3716, 3717, 3718 3671, 3672, 3673
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