IBM NetVista X40, User Manual

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state, 32-bit memory transfers at 160 Mbytes/second, when LVD SCSI peripherals
are attached. This channel supports up to 15 SCSI devices. In addition, the SCSI
adapter uses:
v
Double-transition clocking to achieve high transfer rates
v
Domain name validation to negotiate compatible data transfer speeds with each
device
v
Cyclic-redundancy checking, instead of the usual parity checking, to significantly
improve data reliability
SCSI cabling requirements: You can install two internal SCSI devices using the
SCSI signal cable that comes with your computer. If you plan to attach external
SCSI devices, you must order additional SCSI cables. To select and order the
correct cables for use with external devices, contact your IBM reseller or IBM
marketing representative. To receive indication of SCSI hard-disk drive activity,
you must also connect the SCSI adapter to the SCSI LED (J3) connector on the
system board. See “System and PCI extender board option connectors” on page 35
for the location of the SCSI connector.
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 computer
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 computer, you can use its 68-pin SCSI
connector to connect different types of SCSI devices.
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1
68 35
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IBM
®
IntelliStation
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E Pro: User’s Guide IntelliStation E Pro Types 6836, 6846