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(disk drive module). For more information, see "Using the Service Aids" in RS/6000
Enterprise Server Model F80, Eserver pSeries 620 Models 6F0 and 6F1 User's Guide
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. 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.
The SSA links must be configured as loops. The loop is connected to the internal
connectors at the SSA adapter card. These connectors must be a valid pair (that is, A1
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Service Guide
Connector B2
Green Light
Connector B1
Connector A2
Green Light
Connector A1
Type-Number
Label
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