IBM 7133 Series Service Manual

| Example 4| This link is between a disk drive module and an SSA adapter. It has five parts.BackplaneSignal Cardo rBypass CardDiskD riveAdapterCable7133| Example 5| This link is between two SSA adapters. It has five parts. Note that it has fiber optic| cables and Fibre-Optic Extenders instead of normal SSA cables.Fiber Optic CablesAdapterAdapterFibre-OpticExtenderFibre-OpticExtender| Link Status (Ready) Lights| If a fault occurs that prevents the operation of a particular link, the link status lights of the| various parts of the complete link show that the error has occurred.| You can find the failing link by looking for the flashing green status light at each end of the| affected link. Some configurations have other indicators along the link (for example, on| bypass cards or Fibre-Optic Extenders) to help with FRU isolation.| The meanings of the lights are summarized here. If you need more information about the| lights, see:| “Lights and Power Switch” on page 1-3 for disk drive lights and bypass card lights of| the 7133| The SSA Adapters: User’s Guide and Maintenance Information manual for the lights of| the SSA adapter.| Summary of Disk Drive and Adapter Lights| Link Status (Ready) Light| Status of Light| Meaning| Off| Both SSA links are inactive. For more information, see “Disk Drive Module| Lights” on page 1-8.| Permanently on| Both SSA links are active.| Slow flash| (two seconds on,| two seconds off)| Only one SSA link is active.Chapter 2. Problem Determination Procedures 2-13