Serial Connectors; Ultra320 Scsi Connector - IBM eServer xSeries 226 Type 8648 Option Installation Manual

Serial connectors

Use the serial connectors to connect serial devices. The following illustration shows
a serial connector.

Ultra320 SCSI connector

You can install up to four internal SCSI devices in some models of the server.
These models come with one SCSI cable that is connected from the internal SCSI
connector to the standard hot-swap-drive backplane. You can attach additional
internal SCSI devices to the other internal SCSI connector, or you can use the
connector to attach external SCSI devices. To connect external SCSI devices,
remove the SCSI knockout from the rear of the server and secure the free end of
an optional cable in the new opening.
If you want to attach external SCSI devices to the server without using the internal
SCSI channel, you must install an optional SCSI adapter.
Notes:
1. External SCSI devices connected to internal SCSI channel will operate
2. If you install a PCI RAID adapter to configure and manage the internal hot-swap
An optional external SCSI connector might be installed on the rear of the server.
Use this connector to connect external SCSI devices. The following illustration
shows a SCSI standard 68-pin, female D-shell SCSI connector.
Your server has a dual-channel 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
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
asynchronously.
drives, you must move the SCSI cable from the system-board SCSI connector
to an internal channel connector on the RAID adapter. See "Cabling an optional
SCSI adapter" on page 33 for additional information.
data-transfer rates
device
1 5
6 9
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68
Chapter 3. Input/output connectors
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35
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