Connecting Internal And External Devices; Internal Scsi Device Connections - LSI ITI8000 Series User Manual

3.4

Connecting Internal and External Devices

3.4.1

Internal SCSI Device Connections

3.4.1.1 Attaching Ultra2 SCSI LVD Devices
3-8
This section provides information about making internal and external
SCSI bus connections.
To connect internal SCSI devices to the ITI8241C-R rear I/O adapter, use
a multiconductor 68-position ribbon cable for 16-bit devices. There is one
68-position connector for each of the two SCSI buses. SCSI bus A is
wired to J7 and SCSI bus B is wired to J8.
All Ultra2 SCSI LVD/SE connectors can run LVD SCSI at 80 Mbytes/s.
To maximize the performance of the card, use all LVD capable devices.
If you connect a non-LVD device to the LVD bus, the device runs in SE
mode. This reduces the maximum performance of the port to 40
Mbytes/s.
If the SCSI bus is not in LVD mode (LVD LED is off), the SCSI bus length
must be kept to the Ultra2 SCSI SE length of 1.5 meters.
Note: If the LVD LED is not illuminated, the LVD bus is not
running in LVD mode. This is a quick check to indicate if a
non-Ultra2 SCSI LVD device is on the LVD segment of the
card.
You can use a differential internal cable (50-401030) to attach internal
LVD disks to the ITI8241C-R Rear I/O module. The LVD cable must be
plugged into one of the LVD/SE connectors on the rear I/O adapter (J7
or J8). You must connect all internal LVD devices to this cable.
To configure internal devices on the LVD/SE bus, follow these steps:
Step 1. Set the device to a unique SCSI ID (0–6 or 8–15).
The host adapter default is SCSI ID 7.
Step 2. Plug the unterminated end of the SCSI cable into the LSI Logic
CompactPCI adapter, making sure pin 1 (usually marked on the
cable with a red stripe), corresponds to pin 1 on the connector.
Configuring SCSI Devices
Rev. 1.0 Copyright © 2000–2001 by LSI Logic Corporation. All rights reserved.