Ultra320 Scsi Connector; Scsi Cabling Requirements; Setting Scsi Ids; Universal Serial Bus Connectors - IBM 6219 - IntelliStation M - Pro User Manual

Ultra320 SCSI connector

Your computer has an integrated SCSI controller. This single-channel controller
supports an independent, Ultra320 SCSI channel. The SCSI connector for the
channel is on the system board. The channel supports up to 15 SCSI devices. This
controller uses:
v Double-transition clocking to achieve up to 320 MB-per-second data-transfer
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

SCSI cabling requirements

You can install four internal SCSI devices using the SCSI signal cable that comes
with some computer models. If you plan to attach external SCSI devices, you must
order an optional PCI SCSI adapter and external cable. To select and order the
correct cables for use with external devices, contact your IBM reseller or IBM
marketing representative. 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 internal connectors" on page 32 for the location of the
SCSI connectors.

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. See the information that is provided with the device for instructions about
setting its SCSI ID.

Universal Serial Bus connectors

There are four Universal Serial Bus (USB) 2.0 connectors, two on the front and two
on the rear of the computer. Use the USB connectors to connect optional telephony
and multimedia devices. USB 2.0 technology transfers data at up to 480 Mb per
second (Mbps) with a maximum of 127 external devices and a maximum signal
distance of 5 meters (16 ft) per segment (if the device that is attached to the
computer is a USB 2.0 device). If the computer has multiple USB devices attached
to it, the USB hub must be USB 2.0, otherwise, all USB 2.0 devices will transfer
data at 12 Mbps. Using Plug and Play technology, USB devices are configured
automatically. The following illustration shows a USB connector.
Use a 4-pin USB cable to connect external devices to USB connectors.
If you connect a PS/2 (non-USB) keyboard to the keyboard connector, USB ports
and devices are disabled during power-on self-test (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.
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