Serial Connectors; Ultra320 Scsi Connector; Universal Serial Bus Connectors - IBM 6223 User Manual

Serial connectors

There are two serial connectors on the rear of the computer. Use these connectors
to connect serial devices. The following illustration shows a serial connector.

Ultra320 SCSI connector

Your computer has an integrated SCSI controller. This dual-channel controller
supports two independent, Ultra320 SCSI channels that support up to 15 SCSI
devices each. The SCSI connectors for the channels are on the system board. 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 four 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 additional SCSI cable, remove the SCSI knockout from the rear of the
computer, and connect the new cable from the SCSI channel A connector on the
system board to this opening. To select and order the correct cables for use with
external devices, contact your IBM marketing representative or authorized reseller.
See "System-board internal connectors" on page 36 for the locations of the SCSI
connectors.
If you want to attach external SCSI devices to the computer without using the
internal SCSI channel B, you must install an optional SCSI adapter.
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.

Universal Serial Bus connectors

There are six Universal Serial Bus (USB) 2.0 connectors, two on the front and four
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 Mbps (Mb
per second) with a maximum of 127 external devices and a maximum signal
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