Scsi Cabling Requirements; Setting Scsi Ids; Scsi Connector Pin-Number Assignments - IBM 86655RY - Netfinity 7600 - 8665 Hardware Maintenance Manual

Table 14. 68-pin SCSI connector pin-number assignments.
Pin
1 +Data 12
2 +Data 13
3 +Data 14
4 +Data 15
5 +Data P1
6 +Data 0
7 +Data1
8 +Data 2
9 +Data 3
10 +Data 4
11 +Data 5
12 +Data 6
13 +Data 7
14 +Data P
15 Ground
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Hardware Maintenance Manual: Netfinity 7600 – Type 8665 Models 1RY, 2RY

SCSI cabling requirements

If you plan to attach external SCSI devices, you must 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 SCSI cable between the terminated
ends of the cable, refer to the ANSI SCSI standards. Adhering to these standards will
help ensure that the 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.
Signal
34
68
Pin
35 -Data 12
36 -Data 13
37 -Data 14
38 -Data 15
39 -Data P1
40 -Data 0
41 -Data 1
42 -Data 2
43 -Data 3
44 -Data 4
45 -Data 5
46 -Data 6
47 -Data 7
48 -Data P
49 Ground
1
35
Signal