IBM 8479 Hardware Maintenance Manual - Page 83
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plan to attach external SCSI devices, you must install an optional SCSI PCI adapter and order additional SCSI cables. To select and order the correct cables for use with external devices, contact your IBM reseller or IBM marketing representative. For information about the maximum length of a 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 the server operates correctly. 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. To install external SCSI devices, you must first install an optional SCSI PCI adapter. Refer to the information that is provided with the device for instructions to set its SCSI ID. If a SCSI adapter is installed in the server, you can use its 68-pin SCSI connector to connect different types of SCSI devices. The following table shows the pin-number assignments for the SCSI connector. 34 1 68 35 Table 15. 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 Installing options 75