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The hot-swap-drive backplane controls the SCSI IDs for the internal hot-swap drive
bays. However, when you attach an external SCSI device to an optional SCSI
adapter, you must set a unique ID for the device. See the information that comes
with the device for instructions to set its SCSI ID.
SCSI connector
The following illustration shows a SCSI connector.
Universal Serial Bus version 1.1 connectors
Use a Universal Serial Bus (USB) connector to connect a USB device. USB
technology transfers data at up to 12 Mb per second (Mbps) with a maximum of
127 devices and a maximum signal distance of 5 meters (16 ft) per segment. Using
Plug and Play technology, USB devices are configured automatically. The following
illustration shows a USB connector.
Use a 4-pin cable to connect a device to a USB connector. If you need to connect
more USB devices than the server has USB connectors for, use a USB hub to
connect additional devices.
If you connect a PS/2 (non-USB) keyboard to the keyboard connector, USB ports
and devices are disabled during POST.
If you connect a USB keyboard that has a mouse port, the keyboard emulates a
mouse, and you cannot disable the mouse settings in the Configuration/Setup Utility
program.
Video connector
The integrated super video graphics array (SVGA) video controller is not removable,
but you can disable it through the Configuration/Setup Utility program or by
installing a PCI video adapter.
Note: If you install a PCI video adapter, the server BIOS will automatically disable
42
IBM xSeries 345 Type 8670: Option Installation Guide
Table 4. SCSI IDs for standard hot-swap hard disk drives, controller, and
backplane (continued)
Device
Controller
Backplane
1
34
35
68
the integrated video controller.
SCSI ID
7
8
1
4
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