Serial Connectors; Ultra320 Scsi Connector; Universal Serial Bus Connectors - IBM 622138U - IntelliStation Z - Pro 6221 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

An optional external SCSI connector might be installed on the rear of the computer.
Use this connector to connect external SCSI devices. The following illustration
shows the SCSI standard 68-pin, female D-shell SCSI connector.
Your computer has an integrated SCSI controller with RAID capabilities. This
dual-channel controller supports two independent, Ultra320 SCSI channels. The
SCSI connectors for both channels are on the system board. Each 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), instead of the usual parity checking, to
v An active terminator for SCSI bus termination
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 must
order an additional SCSI cable, remove the SCSI knockout from the rear of the
computer, and connect the new cable from the system board to this opening. To
select and order the correct cables for use with external devices, contact your IBM
reseller or IBM marketing representative. When using an optional SCSI adapter, you
must also connect the SCSI adapter to the SCSI LED (J18) connector on the
system board receive an indication of SCSI hard-disk drive activity. See
"System-board internal connectors" on page 29 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) v2.0 connectors, two on the front of the
computer and two on the rear of the computer. Use the USB connectors to connect
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