StorageWorks Solutions DWZZA 8-Bit SCSI Bus Converter User's Guide

This Users Guide describes the DWZZA 8-Bit SCSI Bus Converter, a SCSI-2 compliant device (available as table-top DWZZA-AA or StorageWorks shelf DWZZA-VA models) designed to bridge incompatible SCSI bus types and extend SCSI bus length.

Key functions and features include:

• Conversion: It acts as a converter between single-ended and differential 8-bit SCSI physical buses, allowing them to function as a single logical bus.
• Bus Extension: It extends the maximum achievable length of a SCSI bus.
• Data Rates: Supports data transfer rates up to 10 MB/s.
• No SCSI ID Consumption: The converter does not use any SCSI device addresses.
• Configurations: It details procedures for installing and configuring the converter in two primary setups: end-bus (where the converter acts as a bus endpoint) and mid-bus (where the bus passes through the converter to other devices).
• Termination: Emphasizes proper bus termination, noting that end-bus configurations use factory-installed terminators, while mid-bus configurations require the removal of differential terminators from the converter's input.
• Cables: Provides guidance on selecting compatible shielded SCSI "A" and "P" cables, considering connector types and maximum cable lengths for different bus speeds.

The guide is intended for customers and Digital employees responsible for installing, configuring, and maintaining StorageWorks subsystems, providing cautions regarding electrostatic discharge (ESD) and operating procedures.