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Single-ended and Differential Interfaces, Connectors

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Operating This Jukebox on a SCSI Bus A Brief Overview of SCSI Operation on a SCSI Bus Single-ended and Differential Interfaces The SCSI bus is electrically implemented in two ways: single-ended and differential. These terms come from the way the signals are asserted on the bus. Single-ended buses use a 5-volt signal that is referenced to ground. This method makes the bus somewhat susceptible to noise and loss of signal quality over distance. The maximum allowable length of a single-ended SCSI bus was initially 6 meters (19.7 feet). Fast SCSI required the maximum length of the bus to be reduced to 3 meters (9.8 feet). The differential bus uses two lines for each signal and measures the voltage difference between the two signals. Differential retains more signal quality than single-ended and is not as sensitive to noise, allowing for a longer cable length. The maximum allowable length of a differential bus is 25 meters (82 feet) for all types buses (narrow, wide, fast, Fast-20). Connectors Narrow devices (50-pin) use the following connectors: • 50-pin low-density clip Centronics-type (external) This is a large connector that is similar to a printer cable. This type of connector is gradually being replaced by the Micro D connector, described below. • 50-pin high density Micro D (using thumbscrews or small clips) (external) Appendix B B- 5

Section	Page
HP SureStore 1200mx / 2200mx Optical Jukebox	1
HP SureStore 1200mx / 2200mx Optical Jukebox	1
HP SureStore 1200mx / 2200mx Optical Jukebox	1
User’s Guide	1
Edition 1	1
HP Part No. C1104-90021	1
Printed in: Greeley, CO USA	1
Printed in: Greeley, CO USA	1
© Copyright August 2000	1
© Copyright August 2000	1
Notice	2
Notice	2
This document contains information that is protected by copyright. All rights are reserved. No pa...	2
Hewlett-Packard makes no warranty of any kind with regard to this printed material, including, bu...	2
© Copyright August 2000	2
© Copyright August 2000	2
Printing History	2
Printing History	2
New editions of this manual incorporate all material updated since the previous edition. The manu...	2
Typographical Conventions	3
Typographical Conventions	3
The following typographical conventions are used in this manual:	3
Emphasis	3
Emphasis	3
Keycap	3
Keycap	3
Computer Output	3
Computer Output	3
Computer Output	3
WARNING Warnings call attention to a procedure or practice that could result in personal injury i...	3
WARNING Warnings call attention to a procedure or practice that could result in personal injury i...	3
CAUTION Cautions call attention to an operating procedure or practice that could damage the produ...	3
CAUTION Cautions call attention to an operating procedure or practice that could damage the produ...	3
NOTE Notes provide information that can be helpful in understanding the operation of the product.	3
NOTE Notes provide information that can be helpful in understanding the operation of the product.	3
In This Manual	4
In This Manual	4
This user’s guide includes:	4
Chapter 1	4
Chapter 1	4
Chapter 1	4
set-up information for this optical jukebox	4
set-up information for this optical jukebox	4
Chapter 2	4
Chapter 2	4
information about choosing and using optical disks	4
information about choosing and using optical disks	4
Chapter 3	4
Chapter 3	4
features description, operating instructions, and troubleshooting information	4
features description, operating instructions, and troubleshooting information	4
Appendix A	4
Appendix A	4
supplies and customer support	4
supplies and customer support	4
Appendix B	4
Appendix B	4
operating this jukebox on a SCSI bus	4
operating this jukebox on a SCSI bus	4
Appendix C	4
Appendix C	4
safety and regulatory information	4
safety and regulatory information	4
Glossary of Terms	4
Index	4
1 Setting Up the Jukebox	13
1 Setting Up the Jukebox	13
Overview of This Chapter	14
Overview of This Chapter	14
This chapter gives information about the following topics:	14
• right side panel features	14
• right side panel features	14
• right side panel features	14
connecting SCSI and power cords	14
• moving or shipping the jukebox	14
• moving or shipping the jukebox	14
• moving or shipping the jukebox	14
• connecting SCSI and power cords	14
• connecting SCSI and power cords	14
• connecting SCSI and power cords	14
setting up:items included	14
setting up:items included	14
setting up:items included	14
setting up:items not included	14
Items included with the jukebox:	14
• power cord	14
• power cord	14
• power cord	14
• single-ended and differential SCSI terminators	14
• single-ended and differential SCSI terminators	14
- one of each included in a 4- or 6-drive jukebox	14
- one of each included in a 4- or 6-drive jukebox	14
- one of each included in a 4- or 6-drive jukebox	14
- two of each included in a 10-drive jukebox	14
- two of each included in a 10-drive jukebox	14
- this guide	14
- this guide	14
Items needed but not included with the jukebox:	14
• SCSI cable with either a high-density 50-pin (Micro D) or high-density 68-pin (Micro D) connect...	14
• SCSI cable with either a high-density 50-pin (Micro D) or high-density 68-pin (Micro D) connect...	14
• SCSI cable with either a high-density 50-pin (Micro D) or high-density 68-pin (Micro D) connect...	14
• single-ended or differential SCSI host adapter with at least one available address. If you have...	14
• single-ended or differential SCSI host adapter with at least one available address. If you have...	14
• application software that supports this type of jukebox	14
• application software that supports this type of jukebox	14
system components needed	15
system components needed	15
system components needed	15
This jukebox requires application software to operate it as a single storage device composed of m...	15
Standard Configuration	15
Standard Configuration	15
The following list is a hierarchy of the system components needed to operate this jukebox in a st...	15
• Host computer CPU	15
• Host computer CPU	15
• Host computer CPU	15
• Operating system	15
• Operating system	15
• Optical jukebox application software	15
• Optical jukebox application software	15
• Jukebox SCSI drivers (may be included in optical jukebox application software above)	15
• Jukebox SCSI drivers (may be included in optical jukebox application software above)	15
• Jukebox	15
• Jukebox	15
High-Availability Configuration	15
High-Availability Configuration	15
The following list is a hierarchy of the system components needed to operate this jukebox in a hi...	15
• Host computer CPUs (two host computers)	15
• Host computer CPUs (two host computers)	15
• Host computer CPUs (two host computers)	15
• Operating systems (on two host computers)	15
• Operating systems (on two host computers)	15
• High-availability application software (links both host computers)	15
• High-availability application software (links both host computers)	15
• Optical jukebox application software (on both host computers)	15
• Optical jukebox application software (on both host computers)	15
• Jukebox SCSI drivers (may be included in optical jukebox application software above)	15
• Jukebox SCSI drivers (may be included in optical jukebox application software above)	15
• Jukebox	15
• Jukebox	15
Identifying Right-Side Panel Features	16
Identifying Right-Side Panel Features	16
Figure 1-1 Right-Side Panel Features — 10-Drive Jukebox Shown	16
Figure 1-1 Right-Side Panel Features — 10-Drive Jukebox Shown	16
<GRAPHIC>	17
<TABLE>	17
<TABLE>	17
<TABLE BODY>	17
<TABLE ROW>	17
1	17
Active bus indicator	17
SCSI interface:active bus indicator	17
active bus indicator	17
Lit when the SCSI bus is active. There is an indicator for each single-ended and each differentia...	17
<TABLE ROW>	17
2	17
SCSI interface selection switch	17
SCSI interface:interface selection switch	17
interface selection switch	17
Used to select either a single-ended or differential SCSI interface on the SCSI interface board.	17
Used to select either a single-ended or differential SCSI interface on the SCSI interface board.	17
In 4- or 6-drive jukeboxes, there is one interface board. In 10-drive jukeboxes, there are two in...	17
<TABLE ROW>	17
3	17
SCSI ports	17
SCSI interface:ports	17
Used for connecting SCSI cables to the interface board. The interface board has two types of inte...	17
Used for connecting SCSI cables to the interface board. The interface board has two	17
<TABLE ROW>	17
4	17
Power cord strain relief clip	17
strain relief clip	17
Used to route the power cord away from other connectors and provide strain relief for the power c...	17
Used to route the power cord away from other connectors and provide strain relief for the power c...	17
<TABLE ROW>	17
5	17
Product serial number label	17
serial number location	17
Needed for service calls. Write down your jukebox serial number before you call your service repr...	17
Needed for service calls. Write down your jukebox serial number before you call your service repr...	17
<TABLE ROW>	17
6	17
Access panel and mounting screws	17
access panel:location	17
access panel:mounting screws	17
Panel that covers the interface and power connection components. The panel is secured by two scre...	17
Panel that covers the interface and power connection components. The panel is secured by two scre...	17
<TABLE ROW>	17
Continued on the next page	17
<TABLE ROW>	17
7	17
Cable access hole	17
cable access hole	17
Used to pass SCSI and power cables through to the inside of the jukebox.	17
Used to pass SCSI and power cables through to the inside of the jukebox.	17
<TABLE ROW>	17
8	17
Power switch	17
power switch	17
switch:power	17
The power switch is under the panel but can be operated through the hole in the panel. Turns powe...	17
The power switch is under the panel but can be operated through the hole in the panel. Turns powe...	17
<TABLE ROW>	17
9	17
Power receptacle	17
power receptacle	17
Receptacle for the jukebox power cord. Located on the bottom of the power distribution assembly.	17
Receptacle for the jukebox power cord. Located on the bottom of the power distribution assembly.	17
NOTE Two screws secure the customer access panel to the side of jukebox during shipment from the ...	18
NOTE Two screws secure the customer access panel to the side of jukebox during shipment from the ...	18
SCSI cables:connecting	19
SCSI cables:connecting	19
SCSI cables:connecting	19
connecting SCSI cables	19
In all configurations, the following cabling capabilities apply:	19
<TABLE>	19
<TABLE>	19
<TABLE BODY>	19
<TABLE ROW>	19
Interface types available	19
Single-ended or differential SCSI, selected by the interface selection switch on each interface card	19
Single-ended or differential SCSI, selected by the interface selection switch on each interface card	19
<TABLE ROW>	19
Number of interface cards available	19
One card in 4- and 6-drive models, two cards in 10-drive models	19
One card in 4- and 6-drive models, two cards in 10-drive models	19
<TABLE ROW>	19
Number of hosts	19
This jukebox may be used in high availability environments. High availability environments can be...	19
This jukebox may be used in high availability environments. High availability environments can be...	19
This jukebox may be used in high availability environments. High availability environments can be...	19
SCSI cables:maximum length	19
SCSI cables:maximum length	19
maximum cable length	19
Table 1-1 Maximum SCSI External Cable Lengths (Assuming no devices internal to the host computer)	19
Table 1-1 Maximum SCSI External Cable Lengths (Assuming no devices internal to the host computer)	19
<TABLE>	19
<TABLE HEADING>	19
<TABLE ROW>	19
Interface Type	19
Maximum External Cable Length	19
<TABLE BODY>	19
<TABLE ROW>	19
Single-Ended SCSI (50-pin high-density connector)	19
3 meters (9.8 feet)	19
<TABLE ROW>	19
Differential SCSI (68-pin high-density connector)	19
25 meters (82.0 feet)	19
NOTE Hewlett-Packard recommends that you use SCSI cables with thumbscrew connectors. Clip type ca...	19
NOTE Hewlett-Packard recommends that you use SCSI cables with thumbscrew connectors. Clip type ca...	19
Choosing Your cabling Configuration	20
Choosing Your cabling Configuration	20
Pick the configuration that applies to your plans below. You will be shown the page for the prope...	20
<TABLE>	20
<TABLE>	20
<TABLE BODY>	20
<TABLE ROW>	20
See page	20
See page	20
<TABLE ROW>	20
Standard Configuration	20
Standard Configuration	20
<TABLE ROW>	20
• The only peripheral on a bus	20
<TABLE ROW>	20
... and the jukebox has 4 or 6 drives	20
1-9	20
<TABLE ROW>	20
... and the jukebox has 10 drives and you are using two host adapters	20
1-12	20
<TABLE ROW>	20
... and the jukebox has 10 drives and you are using one host adapter	20
1-14	20
<TABLE ROW>	20
• The jukebox will share a bus with other devices	20
1-16	20
<TABLE ROW>	20
<TABLE ROW>	20
High Availability configuration	20
High Availability configuration	20
<TABLE ROW>	20
• Consult with your high-availability vendor	20
—	20
connecting:4- or 6-drive jukebox	21
connecting:4- or 6-drive jukebox	21
connecting:4- or 6-drive jukebox	21
CAUTION Make sure that all peripheral devices connected to the host computer have been properly s...	21
CAUTION Make sure that all peripheral devices connected to the host computer have been properly s...	21
Removing the Customer Access Panel	21
Removing the Customer Access Panel	21
1. Switch off power to the host computer before you connect the jukebox	21
1. Switch off power to the host computer before you connect the jukebox	21
1. Switch off power to the host computer before you connect the jukebox	21
NOTE The jukebox ships from the factory with two screws securing the bottom of the customer acces...	21
NOTE The jukebox ships from the factory with two screws securing the bottom of the customer acces...	21
These screws may not have been replaced.	21
It is a good idea to use the screws to secure the access panel to the jukebox since they must be ...	21
If you have to replace these screws, they are 6/32 x .437.	21
2. Remove the customer access panel by pulling on the bottom of the panel and then lifting it off...	21
2. Remove the customer access panel by pulling on the bottom of the panel and then lifting it off...	21
Refer to the following diagram in the next steps.	22
Refer to the following diagram in the next steps.	22
3. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	22
3. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	22
3. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	22
The diagram shows connecting a cable to the differential (“B”) interface.	22
4. Connect a cable between your host computer and either port of the jukebox SCSI connectors of y...	22
4. Connect a cable between your host computer and either port of the jukebox SCSI connectors of y...	22
Route the cable through the slot at the bottom of the right side (“C”).	22
5. Plug a SCSI terminator into the unused SCSI port of interface type you chose (the example diag...	22
5. Plug a SCSI terminator into the unused SCSI port of interface type you chose (the example diag...	22
If you are using the differential interface, use a 68-pin high-density terminator. If you are usi...	22
Figure 1-2 Connecting a 4- or 6-Drive Jukebox	22
Figure 1-2 Connecting a 4- or 6-Drive Jukebox	22
<GRAPHIC>	22
6. Plug a SCSI terminator into one of the SCSI ports on the unused interface. Only one terminator...	22
The example diagram shows the terminator on the single-ended interface connector “A2” but the ter...	22
Use an active terminator if you are terminating a single-ended interface.	22
If you are terminating a differential interface, use a 68-pin high-density terminator. If you are...	23
7. To continue with the installation, go to “Connecting Power” in this Chapter.	23
7. To continue with the installation, go to “Connecting Power” in this Chapter.	23
connecting:10-drive jukebox, two host adapters	24
connecting:10-drive jukebox, two host adapters	24
connecting:10-drive jukebox, two host adapters	24
CAUTION Make sure that all peripheral devices connected to the host computer have been properly s...	24
CAUTION Make sure that all peripheral devices connected to the host computer have been properly s...	24
Removing the Customer Access Panel	24
Removing the Customer Access Panel	24
1. Switch off power to the host computer before you connect the jukebox.	24
1. Switch off power to the host computer before you connect the jukebox.	24
1. Switch off power to the host computer before you connect the jukebox.	24
NOTE The jukebox ships from the factory with two screws securing the bottom of the customer acces...	24
NOTE The jukebox ships from the factory with two screws securing the bottom of the customer acces...	24
These screws may not have been replaced.	24
It is a good idea to use the screws to secure the access panel to the jukebox since they must be ...	24
If you have to replace these screws, they are 6/32 x .437.	24
Refer to the following diagram in the next steps.	24
Refer to the following diagram in the next steps.	24
2. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	24
2. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	24
2. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	24
The diagram shows connecting a cable to the differential (“B”) interface.	24
3. Connect cables between the two host adapters on your host computer and two SCSI interfaces on ...	24
3. Connect cables between the two host adapters on your host computer and two SCSI interfaces on ...	24
You can connect the two cables to two interfaces of the same type of different types (single-ende...	24
The diagram shows cable connections to the differential SCSI interface on both interface cards at...	24
Route the cables through the slot at the bottom of the right side (C).	24
4. Remove the customer access panel by pulling on the bottom of the panel and then lifting it off...	25
4. Remove the customer access panel by pulling on the bottom of the panel and then lifting it off...	25
Figure 1-3 Connecting a 10-Drive Jukebox, Two Host Adapters, Basic SCSI Addressing	25
Figure 1-3 Connecting a 10-Drive Jukebox, Two Host Adapters, Basic SCSI Addressing	25
<GRAPHIC>	25
5. Plug a SCSI terminator into the unused SCSI connector of interface type you chose (the example...	25
5. Plug a SCSI terminator into the unused SCSI connector of interface type you chose (the example...	25
If you are using the differential interface, use a 68-pin high-density terminator. If you are usi...	25
6. Plug a SCSI terminator into one of SCSI ports on each unused interface (the example diagram sh...	25
6. Plug a SCSI terminator into one of SCSI ports on each unused interface (the example diagram sh...	25
Use a 50-pin high-density terminator for the single-ended interface or a 68-pin terminator for th...	25
7. To continue with the installation, go to “Connecting Power” in this Chapter.	25
7. To continue with the installation, go to “Connecting Power” in this Chapter.	25
connecting:10-drive jukebox, one host adapter	26
connecting:10-drive jukebox, one host adapter	26
connecting:10-drive jukebox, one host adapter	26
CAUTION Make sure that all peripheral devices connected to the host computer have been properly s...	26
CAUTION Make sure that all peripheral devices connected to the host computer have been properly s...	26
Removing the Customer Access Panel	26
Removing the Customer Access Panel	26
1. Switch off power to the host computer before you connect the jukebox.	26
1. Switch off power to the host computer before you connect the jukebox.	26
1. Switch off power to the host computer before you connect the jukebox.	26
NOTE The jukebox ships from the factory with two screws securing the bottom of the customer acces...	26
NOTE The jukebox ships from the factory with two screws securing the bottom of the customer acces...	26
These screws may not have been replaced.	26
It is a good idea to use the screws to secure the access panel to the jukebox since they must be ...	26
If you have to replace these screws, they are 6/32 x .437.	26
2. Remove the customer access panel by pulling on the bottom of the panel and then lifting it off...	26
2. Remove the customer access panel by pulling on the bottom of the panel and then lifting it off...	26
Refer to the following diagram in the notes steps.	26
Refer to the following diagram in the notes steps.	26
3. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	26
3. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	26
3. Select single-ended (“A”) or differential (“B”) interface using the SCSI interface selection s...	26
The diagram shows connecting the host computer cable to a differential interface port (“B3”). Thi...	26
Route the cable through the slot at the bottom of the right side.	26
4. Connect a short cable between the interface card you have chosen to the other Bus (the example...	26
4. Connect a short cable between the interface card you have chosen to the other Bus (the example...	26
Figure 1-4 Connecting a 10-Drive Jukebox, One Host Adapter, Bus 1 and 2 Daisy-Chained, LUN Addres...	27
Figure 1-4 Connecting a 10-Drive Jukebox, One Host Adapter, Bus 1 and 2 Daisy-Chained, LUN Addres...	27
<GRAPHIC>	27
5. Terminate the daisy-chained bus by plugging a terminator into the unused port of the second in...	27
5. Terminate the daisy-chained bus by plugging a terminator into the unused port of the second in...	27
A differential interface port uses a 68-pin high-density terminator. A single-ended interface por...	27
The same cabling can be done using the single-ended ports.	27
CAUTION Do not daisy-chain between single-ended and differential interfaces.	27
CAUTION Do not daisy-chain between single-ended and differential interfaces.	27
6. Plug a SCSI terminator into one of SCSI ports on each unused interface (the example diagram sh...	27
6. Plug a SCSI terminator into one of SCSI ports on each unused interface (the example diagram sh...	27
6. Plug a SCSI terminator into one of SCSI ports on each unused interface (the example diagram sh...	27
Use a 50-pin high-density active terminator for the single-ended interface or a 68-pin terminator...	27
7. To continue with the installation, go to “Connecting Power” in this Chapter.	27
7. To continue with the installation, go to “Connecting Power” in this Chapter.	27
connecting:with other devices on the bus	28
connecting:with other devices on the bus	28
connecting:with other devices on the bus	28
NOTE Operating this jukebox with other peripherals on the same bus is supported, but not recommen...	28
NOTE Operating this jukebox with other peripherals on the same bus is supported, but not recommen...	28
In most circumstances, the recommended configuration for this jukebox is as the only device on a ...	28
It is possible to connect this jukebox on a bus with additional peripherals in many different way...	28
• a 4- or 6-drive jukebox using basic SCSI addressing or Logical Unit Numbering (LUN) addressing	28
• a 4- or 6-drive jukebox using basic SCSI addressing or Logical Unit Numbering (LUN) addressing	28
• a 4- or 6-drive jukebox using basic SCSI addressing or Logical Unit Numbering (LUN) addressing	28
• a 10-drive jukebox with one host adapter and with LUN addressing, daisy-chaining Bus 1 and Bus ...	28
• a 10-drive jukebox with one host adapter and with LUN addressing, daisy-chaining Bus 1 and Bus ...	28
• a 10-drive jukebox with two host adapters and using LUN addressing	28
• a 10-drive jukebox with two host adapters and using LUN addressing	28
There are many issues that must be considered when connecting other devices on a bus with this ju...	28
• how the jukebox is used; archiving, backup, near-line storage. What performance must be maintained	28
• how the jukebox is used; archiving, backup, near-line storage. What performance must be maintained	28
• how the jukebox is used; archiving, backup, near-line storage. What performance must be maintained	28
• how the additional peripheral will be used. How much demand will it place on the bus	28
• how the additional peripheral will be used. How much demand will it place on the bus	28
• whether you will be mixing “wide” and “narrow” devices on the bus.	28
• whether you will be mixing “wide” and “narrow” devices on the bus.	28
• whether you are using both internal and external segments on your SCSI host adapter	28
• whether you are using both internal and external segments on your SCSI host adapter	28
• whether your bus is single-ended or differential	28
• whether your bus is single-ended or differential	28
NOTE Appendix B provides a brief overview of SCSI and the issues you must consider when placing o...	28
NOTE Appendix B provides a brief overview of SCSI and the issues you must consider when placing o...	28
connecting:power	29
connecting:power	29
connecting:power	29
1. Ensure that the power switch on the jukebox is OFF (“5” on Figure 1-1)	29
1. Ensure that the power switch on the jukebox is OFF (“5” on Figure 1-1)	29
1. Ensure that the power switch on the jukebox is OFF (“5” on Figure 1-1)	29
NOTE Use the power cord shipped with the jukebox.	29
NOTE Use the power cord shipped with the jukebox.	29
2. Route the power cord through the strain relief clip (“4” on Figure 1-1) and close the clip snu...	29
2. Route the power cord through the strain relief clip (“4” on Figure 1-1) and close the clip snu...	29
2. Route the power cord through the strain relief clip (“4” on Figure 1-1) and close the clip snu...	29
3. Plug the socket end of the power cord into the power port on bottom of the power distribution ...	29
3. Plug the socket end of the power cord into the power port on bottom of the power distribution ...	29
4. Continue to route the power cable down, through the long cable slot at the bottom of the jukeb...	29
4. Continue to route the power cable down, through the long cable slot at the bottom of the jukeb...	29
5. Plug the other end of the power cord into a three-hole grounded outlet.	29
5. Plug the other end of the power cord into a three-hole grounded outlet.	29
6. Press the power switch ON (“8” on Figure 1-1)	29
6. Press the power switch ON (“8” on Figure 1-1)	29
When power is applied, TESTING and NOT READY alternately display. Once the poweron test completes...	29
NOTE If DEVICE FAILED displays. See “Troubleshooting” in Chapter 3 for troubleshooting procedures.	29
NOTE If DEVICE FAILED displays. See “Troubleshooting” in Chapter 3 for troubleshooting procedures.	29
7. Refer to Chapter 3, “Operating the Jukebox” for instructions on setting the SCSI addresses, lo...	29
7. Refer to Chapter 3, “Operating the Jukebox” for instructions on setting the SCSI addresses, lo...	29
7. Refer to Chapter 3, “Operating the Jukebox” for instructions on setting the SCSI addresses, lo...	29
NOTE Continue on to “Configuring Write Verify” on the next page.	29
NOTE Continue on to “Configuring Write Verify” on the next page.	29
configuring write verify	30
configuring write verify	30
configuring write verify	30
write verify	30
The write verify configuration ensures that data is written reliably to an optical disk. The juke...	30
Writing data on a magneto-optical disk requires two passes. The first pass erases the data in the...	30
When write verify is configured to ON, an additional pass is made over the sector. This third pas...	30
If you choose to change the write verify configuration to OFF, refer to “Configuring Operating Co...	30
NOTE Continue on to “Installing the Wheel Chocks ” on the next page.	30
NOTE Continue on to “Installing the Wheel Chocks ” on the next page.	30
wheel chocks	31
wheel chocks	31
wheel chocks	31
installing the wheel chocks	31
chocks	31
WARNING This jukebox rolls easily and could cause injury or damage if allowed to move unintention...	31
WARNING This jukebox rolls easily and could cause injury or damage if allowed to move unintention...	31
Four wheel chocks are provided to stabilize the jukebox in position. Install the wheel chocks aft...	31
Figure 1-5 Installing the Wheel Chocks	31
Figure 1-5 Installing the Wheel Chocks	31
<GRAPHIC>	31
1. After all cables and panels are mounted, roll the unit to its final position.	31
1. After all cables and panels are mounted, roll the unit to its final position.	31
2. Spread the chock apart slightly and slide it around the bottom of the wheel as shown on the le...	31
2. Spread the chock apart slightly and slide it around the bottom of the wheel as shown on the le...	31
3. Repeat Step 2 for the remaining three wheels.	31
3. Repeat Step 2 for the remaining three wheels.	31
NOTE This is the last step in the physical installation.	31
NOTE This is the last step in the physical installation.	31
Moving or Shipping the Jukebox	32
Moving or Shipping the Jukebox	32
Refer to the following two sections if you want to move or ship the optical jukebox. If you want ...	32
moving the jukebox	32
moving the jukebox	32
moving the jukebox	32
1. If you will be removing the disks from the jukebox, follow your jukebox application software i...	32
1. If you will be removing the disks from the jukebox, follow your jukebox application software i...	32
1. If you will be removing the disks from the jukebox, follow your jukebox application software i...	32
Ensure that there are no disks in the drives.	32
If you will be manually ejecting disks, refer to “Ejecting an Optical Disk From the Jukebox” in C...	32
CAUTION Failure to eject a disk from the optical drive prior to moving the jukebox could result i...	32
CAUTION Failure to eject a disk from the optical drive prior to moving the jukebox could result i...	32
CAUTION Turning off the jukebox in the next step could cause data loss if not done correctly.	32
CAUTION Turning off the jukebox in the next step could cause data loss if not done correctly.	32
Do not turn off power to the jukebox until you are sure the SCSI bus is inactive. Removing power ...	32

Match case Limit results 1 per page

Appendix B

B-5

Operating This Jukebox on a SCSI Bus

A Brief Overview of SCSI

Operation on a

SCSI Bus

Single-ended and Differential Interfaces

The SCSI bus is electrically implemented in two ways: single-ended and

differential. These terms come from the way the signals are asserted on the bus.

Single-ended buses use a 5-volt signal that is referenced to ground. This method

makes the bus somewhat susceptible to noise and loss of signal quality over

distance. The maximum allowable length of a single-ended SCSI bus was initially 6

meters (19.7 feet). Fast SCSI required the maximum length of the bus to be reduced

to 3 meters (9.8 feet).

The differential bus uses two lines for each signal and measures the voltage

difference between the two signals. Differential retains more signal quality than

single-ended and is not as sensitive to noise, allowing for a longer cable length. The

maximum allowable length of a differential bus is 25 meters (82 feet) for all types

buses (narrow, wide, fast, Fast-20).

Connectors

Narrow devices (50-pin) use the following connectors:

•

50-pin low-density clip Centronics-type (external)

This is a large connector that is similar to a printer cable. This type of connector

is gradually being replaced by the Micro D connector, described below.

•

50-pin high density Micro D (using thumbscrews or small clips) (external)

HP 220mx HP SureStore 1200mx/2200mx Optical Jukebox User&#039;s Guide - Page 93

Single-ended and Differential Interfaces, Connectors

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HP 220mx HP SureStore 1200mx/2200mx Optical Jukebox User's Guide - Page 93