Preliminary task

Perform the following to determine which segment of the HSL/RIO loop has failed:

1. Get the loop number from the reference code if you do not already have it. The hexadecimal loop number is the 4 leftmost characters of the DSA in word 7 of the reference code. Before continuing to the next step, use arepipbusdsabdown.dita#pipbusdsabdown to find the loop number and translate it into decimal format.
2. Sign on to SST or DST (if you have not already done so). Select Start a service tool -> Hardware service manager -> Logical hardware resources -> High-speed link (HSL) resources.
3. Select Resources associated with loop for the loop with the failed link. The HSL bridges will be displayed under the loop.
4. Select Display detail for the loop with the failed link.
5. Select Follow leading port until a port with a status of "failed" is found. Note the resource name, type-model, and serial number for the resource with the failed status.
6. Select Follow leading port one more time and note all the information for the resource name with a failed trailing port.
7. Select Display system information and note the power controlling system. This information may be needed for concurrent replacement at a later time.
8. Select Cancel twice to return to the previous screen.
9. Go to each resource name (found above) and select Associated packaging resource(s). This gives the description of the failing item and the frame ID.
10. Select Display detail to find the part number and location associated with the possible failing item.
11. Now you have the same information you would have if the SAL had complete part number and location information. Perform RIOIP01.