Ultra160 Scsi Connector (Some Models); Scsi Cabling Requirements; Setting Scsi Ids - IBM eServer 200 xSeries User Reference Manual

Ultra160 SCSI connector (some models)

Some xSeries 200 server models come with a SCSI adapter, which supports a single
Ultra160 SCSI channel in a full-featured PCI 2.1-/2.2-compliant bus master package.
This configuration supports a zero wait state, 32-bit memory transfers at 160 MB per
second, when low voltage differential (LVD) SCSI peripherals are attached. This
channel supports up to 15 SCSI devices. In addition, the SCSI adapter uses:
•
•
•
Note: If you install a RAID adapter, you can move the SCSI signal cable from the

SCSI cabling requirements

You can install five internal SCSI devices using the SCSI signal cable that comes with
your server or purchased separately, depending on your server model. If you plan to
attach external SCSI devices, you must install an optional SCSI PCI adapter and
order additional SCSI cables. To select and order the correct cables for use with
external devices, contact your IBM reseller or IBM marketing representative.
For information about the maximum length of a SCSI cable between the terminated
ends of the cable, refer to the American National Standards Institute (ANSI) SCSI
standards. Adhering to these standards will help ensure that your server operates
correctly.

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.
To install external SCSI devices, you must first install an optional SCSI PCI adapter.
Refer to the information that is provided with the device for instructions to set its SCSI
ID.
If a SCSI adapter is installed in your server, you can use its 68-pin SCSI connector to
connect different types of SCSI devices. The following table shows the pin-number
assignments for the SCSI connector.
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IBM xSeries 200: User's Reference
Table 9. Video connector pin-number assignments.
Pin Signal
3 Blue
4 Not connected
5 Ground
Double-transition clocking to achieve high transfer rates
Domain name validation to negotiate compatible data transfer speeds with each
device
Cyclic-redundancy checking, instead of the usual parity checking, to significantly
improve data reliability
SCSI connector on the SCSI adapter to an internal channel connector on the
RAID adapter to control the internal drives from the RAID adapter.
Pin Signal Pin
8 Ground 13
9 +5 V dc 14
DDC
10 Ground 15
34
68
Signal
Horizontal synchronization
(Hsync)
Vertical synchronization (Vsync)
DDC SCL
1
35