IBM 7133 Series Service Manual

| SSA Subsystem Configurations| The diagrams in this section show some sample configurations for the 7133 Models 010| and 500, and for the 7133 Models 020 and 600. All the configurations that are shown| here are the simplest and provide the best ease of use. If performance or availability are| particularly important to the customer, however, more complex cabling might provide a| better solution; consult your marketing representative for more details.| Rules for SSA Loops| Details of the rules for configuring SSA loops are given for each SSA adapter in the SSA| Adapters: User’s Guide and Maintenance Information manual. SSA loops that include disk| drives that are installed in a 7133 must also follow these additional rules:| A maximum of three dummy disk drive modules can be connected to each other in a| particular SSA loop.| The maximum permitted length for an external SSA cable that connects two SSA| nodes (for example, disk drives) is 25 meters (82 feet).| The maximum permitted length for a fiber optic cable that connects two SSA nodes| (for example, disk drives) is 2.4 kilometers (7874 feet).1-42 7133 Service Guide