LSI ITI8000 Series, Руководство пользователя

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3-10 Configuring SCSI Devices
Rev. 1.0 Copyright © 2000–2001 by LSI Logic Corporation. All rights reserved.
external rear I/O connector, or use disks on J8 and disks
on the “B” external rear I/O connector, this will result in
unpredictable behavior.
3.4.2 External SCSI Device Connections
LSI Logic provides optional cables for all external devices. You must
know the type of connector that you require on each end of the cable,
and the length of cable required.
To connect external SCSI devices, follow these steps:
Step 1. Enable termination on the end device only (last device on the
cable).
Step 2. Set each device to have a unique SCSI ID.
All ITI8200 adapters automatically enable or disable SCSI termination by
sensing the cable configuration.
Table 3.1 provides a cable guide to help
you determine the correct cable for your applications.
Note: If you are using external devices, the end of the external
cable must be correctly terminated with an LVD Ultra2
SCSI terminator.
3.4.3 Using the Activity LED
The ITI8000 adapters have a built-in activity LED, which indicates when
the SCSI bus is busy. The LED flashes to indicate activity on the bus.
3.5 Cabling SCSI Devices
All LSI Logic CompactPCI SCSI adapters support up to 15 devices per
SCSI channel. Devices can be connected internally, externally, or a
combination of internally and externally. For Ultra2 SCSI running in LVD
mode, the cable must be kept within 12 meters for multidrop connections
or 25 meters point to point. For Ultra2 SCSI in SE mode, LSI Logic
recommends that the total bus (cable + module etch) length be kept to
1.5 meters.
LSI Logic recommends that you select a high quality SCSI cable for all
device connections, due to the importance of optimal signal integrity.