Ultra320 Scsi Connector - IBM IntelliStation M Pro User Manual

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Ultra320 SCSI connector

The computer might have a mini-PCI SCSI controller. This single-channel controller

supports an independent, Ultra320 SCSI channel that supports up to 15 SCSI

devices. The SCSI connector for the channel is on the mini-PCI SCSI controller.

The controller has the following features:

v Double-transition clocking to achieve up to 320 MBps (megabytes per second)

v Domain name validation to negotiate compatible data-transfer speeds with each

v Cyclic-redundancy checking (CRC) to improve data reliability

v An active terminator for SCSI bus termination

The following illustration shows a SCSI connector.

SCSI cabling requirements

You can install three internal SCSI devices using the SCSI signal cable that comes

with some computer models. If you plan to attach external SCSI devices, you can

order an optional SCSI adapter and external cable. To select and order the correct

cables for use with external devices, contact your IBM marketing representative or

authorized reseller. To receive an indication of SCSI hard-disk drive activity, you

must also connect the SCSI adapter to the SCSI LED connector on the system

board. See "System-board option connectors" on page 38 for the locations of the

SCSI connectors.

Setting SCSI IDs

Each SCSI device that is 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. See the information that comes with the device for

instructions for setting its SCSI ID.

data-transfer rates

device

Chapter 4. Installing options

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