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v Domain name validation to negotiate compatible data transfer speeds with each
v Cyclic-redundancy checking (CRC), instead of the usual parity checking, to
v An active terminator on the system board for SCSI bus termination
You can use the external LVD SCSI channel connector, on the rear of your server,
to connect different types of small computer system interface (SCSI) devices. Inside
the server, a SCSI cable connects the internal SCSI channel connector to the
hot-swap drive backplane.
Note: If you install a PCI RAID adapter to configure and manage the internal
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 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.
Table 7. 68-pin SCSI connector pin-number assignments
Pin
Signal
1
+Data 12
2
+Data 13
3
+Data 14
4
+Data 15
5
+Data P1
6
+Data 0
66
Hardware Maintenance Manual: xSeries 342 Model 1RX, 2RX, 1TG, 2TG
device
significantly improve data reliability
hot-swap drives, you must move the SCSI cable from the system-board SCSI
connector to an internal channel connector on the RAID adapter.
34
68
Pin
Signal
35
-Data 12
36
-Data 13
37
-Data 14
38
-Data 15
39
-Data P1
40
-Data 0
1
35
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