Hewlett-Packard SureStore 125ex Optical Jukebox User's Guide - C1118-90000

OPERATING THIS JUKEBOX ON A SCSI BUS

JUMP

CONTENTS

INDEX

[1]Bus Adapter - connecting point for all SCSI devices

[2] Wide SCSI Device - accepts IDs from 0 to 15

[3] Wide SCSI Cable - 68-pin SCSI Cable

[4] 68-50-Pin SCSI Cable - adapts from wide to narrow connectors - high 18 lines must be terminated

[5] Narrow SCSI Device - accepts IDs from 0 to 7

[5] Terminator - device on the ends of a SCSI bus to prevent reflected signals on the bus (50-pin)

It is very important that the 68-pin to 50-pin cable is properly configured to assure that the eighteen truncated lines are

properly terminated.

MIXING SINGLE-ENDED, HIGH-VOLTAGE DIFFERENTIAL, AND

LOW-VOLTAGE DIFFERENTIAL DEVICES

On a low-voltage differential (LVD) bus, if the jukebox senses a single-ended device on the bus, the bus will be oper-

ated as a single-ended bus. You must not mix high-voltage differential buses with either low-voltage differential or sin-

gle-ended buses. High-voltage signals are on different pins and may damage low-voltage differential circuits.

CABLE LENGTHS

This jukebox can use either a single-ended or low-voltage differential bus. When using a single-ended bus, you have

8.50 feet (2.59 metres) available for an external bus. (3 metres allowable minus 0.41 metres for internal cabling.)

If you are using a low-voltage differential bus, you have 38.04 feet (11.59 metres) available for an external bus. (12