IBM OPTIONS User Manual page 20

Ensure that pins on the LED cable are correctly aligned with the pins on
the connector 3 . Pin-1 on the LED cable should align with the pin
marked 1 in the illustration.
Step 9. Closing the computer
Review your work before closing your computer. Be sure that:
1. The SCSI chain is properly terminated.
2. Each SCSI device on the SCSI chain is set to a unique SCSI ID.
3. The adapter is firmly seated and secured in a PCI expansion slot.
4. Internal SCSI devices are firmly connected to the adapter and pin-1 on each
SCSI cable connector attaches to pin-1 on each SCSI device connector.
5. Power and interface connectors are securely attached.
Replace the computer cover and secure it in place.
Step 10. Connecting external SCSI devices
Connect devices to the SCSI adapter using an additional external cable for each
device connected. Up to 15 Wide SCSI external devices can be connected to the
adapter in a chain.
To start the SCSI chain, do the following:
1. Connect the external SCSI cable to the SCSI adapter 1 . External cable
connectors are designed to plug in only one way.
2. Extend the external SCSI cable from the adapter to the connector on the
first external device. Plug a second external SCSI cable into the second
connector on the first device.
3. Plug the other end of the second external SCSI cable into the next device,
and continue in this fashion until all external devices are connected.
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IBM PCI Ultra160 SCSI Adapter: User's Guide