Appendix B Cables and Connectors

Page B - 2

Introduction

Introduction

Summary

The SCSI specification allows devices to operate with either a single-ended or a differential SCSI interface. The difference between interfaces is the manner in which SCSI signals are driven on the cable.

The differential interface uses two lines for each signal (+SIGNAL and - SIGNAL). A signal is true when +SIGNAL is more positive than -SIGNAL. This interface provides better noise immunity than the single-ended interface and so allows a longer cable length to be used.

The single-ended interface uses one line for each SCSI signal. All devices on a single SCSI bus must operate with the same interface.

The RF3880 is available with a 16-bit differential interface, using a 68-pin high density shielded “P” connector.

This appendix provides the following information:

Pin-outs of the SCSI connector used for the RF3880 adapter.

• Cable Length allowed for the differential SCSI int erface.

Pinouts of the P1 and P2 VMEbus backplane connectors.

This appendix is most useful for those integrating devices into a system.

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User’s Guide

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Ciprico Rimfire 3880 manual Introduction Summary, Appendix B Cables and Connectors Introduction