IBM 8668 Hardware Maintenance Manual - Page 102
Setting SCSI IDs, SCSI connector pin-number assignments, drive bays. However
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For information about the maximum length of SCSI cable between the terminated ends of the cable, refer to the American National Standards Institute (ANSI) SCSI standards. Adhering to these standards will help ensure that your server operates properly. Setting SCSI IDs: Each SCSI device connected to a SCSI controller must have a unique SCSI ID. This ID enables the SCSI controller to identify the device and ensure that different devices on the same SCSI channel do not attempt to transfer data simultaneously. SCSI devices that are connected to different SCSI channels can have duplicate SCSI IDs. The hot-swap-drive backplane controls the SCSI IDs for the internal hot-swap drive bays. However, when you attach SCSI devices to the external SCSI connector, you must set a unique ID for the device. Refer to the information that is provided with the device for instructions to set its SCSI ID. SCSI connector pin-number assignments: The following table shows the pin-number assignments for the 68-pin SCSI connectors. 34 1 68 35 Table 9. 68-pin SCSI connector pin-number assignments Pin Signal Pin Signal 1 +Data 12 35 -Data 12 2 +Data 13 36 -Data 13 3 +Data 14 37 -Data 14 4 +Data 15 38 -Data 15 5 +Data P1 39 -Data P1 6 +Data 0 40 -Data 0 7 +Data1 41 -Data 1 8 +Data 2 42 -Data 2 9 +Data 3 43 -Data 3 10 +Data 4 44 -Data 4 11 +Data 5 45 -Data 5 12 +Data 6 46 -Data 6 13 +Data 7 47 -Data 7 14 +Data P 48 -Data P 15 Ground 49 Ground 16 DIFFSENS 50 Ground 17 Term power 51 Term power 18 Term power 52 Term power 19 Reserved 53 Reserved 20 Ground 54 Ground 21 +Attention 55 -Attention 22 Ground 56 Ground 94 Hardware Maintenance Manual: xSeries 232, Type 8668