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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.
Table 14. 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
34
1
68
35
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