Internal Connections (Models 010 And 020) - IBM 7133 Series Service Manual

Internal Connections (Models 010 and 020)

|
| Inside the 7133, the disk drive modules are connected in strings of four modules. These
| strings are connected to the external SSA connectors at the back of the 7133.
| The following diagrams show the relationships between the disk drive module strings and
| the external SSA connectors at the back of the 7133 Model 010 and the 7133 Model 020.
Model 010 Internal Connections
|
| Table 1-1 on page 1-16 summarizes the relationship between the disk drive module
| strings and the external SSA connectors.
Important: If you are connecting strings of disk drive modules to each other on a
Model 010, ensure that you connect the disk drive modules in the correct (numeric)
sequence on the loop or loops. For example, if you are connecting disk drive modules 1
through 4 to disk drive modules 5 through 8, connect an SSA cable from connector J9 to
connector J6 (see the diagram on this page). That cable connects disk drive module
number 4 to disk drive module number 5. Disk drive modules 1 through 8 are now
connected in numeric sequence.
The connecting of disk drive modules in the correct sequence is important for the
operation and maintenance of the subsystem; it enables operators and service
representatives to identify disk drive modules more easily.
Chapter 1. Reference Information
1-17