HP Surestore 125ex Hewlett-Packard SureStore 125ex Optical Jukebox User&#1 - Page 108

Ixing, Ingle, Oltage, Ifferential, Evices, Engths

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B NEXT PREVIOUS JUMP CONTENTS INDEX OPERATING THIS JUKEBOX ON A SCSI BUS [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 operated as a single-ended bus. You must not mix high-voltage differential buses with either low-voltage differential or single-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 13

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B
O
PERATING
T
HIS
J
UKEBOX
ON
A
SCSI B
US
B
13
NEXT
PREVIOUS
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.
M
IXING
S
INGLE
-E
NDED
, H
IGH
-V
OLTAGE
D
IFFERENTIAL
,
AND
L
OW
-V
OLTAGE
D
IFFERENTIAL
D
EVICES
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.
C
ABLE
L
ENGTHS
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