IBM RS6000 Service Guide - Page 131

SSA Loops and Links The disk drive modules of the system unit are connected through two SSA links to an SSA adapter that is located in the using system. The disk drive modules, SSA links, and SSA adapter are configured in loops. Each loop provides a data path that starts at one connector of the SSA adapter and passes through a link (SSA cable) to the disk drive modules. The path continues through the disk drive modules, then returns through another link to a second connector on the SSA adapter. The SSA Adapter The system unit can be attached to an SSA adapter. See Figure 3-1. The adapter card has four SSA connectors that are arranged in two pairs. Connectors A1 and A2 are one pair; connectors B1 and B2 are the other pair. Connectors B1 and B2 are used on 7025 Model F50, since they support the internal and external SSA cable options. Figure 3-1. SSA Adapter Card Chapter 3. Error Code to FRU Index 3-59