IBM 7133 Series Service Manual

| SSA Link Errors| SSA link errors can be caused if:| Power is removed from an SSA device| An SSA device is failing| An SSA device is removed| A cable is disconnected.| Such errors might be indicated by:| SRN 45PAA| A flashing link status (or Ready) light on the SSA device at each end of the failing link| The indication of an open link by the Link Verification Service Aid.| SSA Link Error Problem Determination| Instead of using the normal MAPs to solve a link error problem, you can refer directly to| the link status lights to isolate the failing FRU. The descriptions given here show you how| to do this.| In an SSA loop, SSA devices are connected through two or more SSA links to an SSA| adapter. Each SSA link is the connection between two SSA nodes (devices or adapters);| for example, disk drive module to disk drive module, adapter to disk drive module, or| adapter to adapter.| An SSA link can contain several parts. When doing problem determination, think of the| link and all its parts as one complete item.| Here are some examples of SSA links. Each link contains more than one part.Chapter 2. Problem Determination Procedures 2-11