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SNC 5100
56 SCSI Channel MAP
6-00020-02
Examine SCSI Cables
Caution
If in this procedure you determine that you need to remove a SCSI
cable, all I/O to the SNC 5100 must be stopped and the SNC 5100
must be turned off.
Step 1. Look for damaged cables.
Check for breaks in the cable jacket, exposed or frayed cable shield,
exposed or broken wires.
Step 2. Replace any damaged cables.
Step 3. Look for inadequate cables.
Older SCSI cables may not be suitable for running at Ultra2/3
speeds. Be sure all cables are rated for Ultra2/3.
Step 4. Replace any cables not suitable for running at Ultra 2/3 speeds.
Step 5. Check for mixed cable types.
If a SCSI bus has both round cables and flat ribbon cables, it may
suffer problems when running at Ultra2/3 speeds.
Use the same cable type consistently for all segments of the SCSI
bus.
Step 6. Replace any cables that are of the wrong type.
Step 7. Check for unshielded cables.
An unshielded SCSI cable used external to a cabinet may cause
reliability problems, due to interference from other electrical
devices.
Step 8. Replace all unshielded cables.
If no cables are replaced, go to "Examine SCSI Connectors".
If cables were replaced, go to "SCSI Health Check".