HP Surestore 80ex HP SureStore Optical Disk Jukebox User's Guide - C1100-90015 - Page 80

Cable Lengths, Termination

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Operating This Jukebox on a SCSI Bus The SCSI Bus and This Jukebox 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. Cable Lengths This jukebox uses a single-ended bus. The maximum bus length for this "fast" device on a single-ended bus is 3 meters (9.8 feet). The internal cable length of the jukebox is 1.5 meters (4.9 feet) which leaves 1.5 meters (4.9 feet) for the rest of the bus. Termination • Refer to the documentation that comes with your particular adapter to see how to apply termination. • Use active terminators to reduce noise sensitivity. • Never terminate the bus at any place except the physical ends. Terminating the bus in the middle will probably cause the bus to become inoperable or operate in a state that could cause data loss. • If devices are on both sides of the host computer adapter (such as hard drives internal to the host computer and a jukebox external to the host computer) make sure that there is no termination on the host computer adapter. Termination must be only on the device inside the computer that is farthest away (on the bus) from the host adapter, and on the last physical device external to the computer. B- 8 Appendix B

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B-8
Appendix B
Operating This Jukebox on a SCSI Bus
The SCSI Bus and This Jukebox
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.
Cable Lengths
This jukebox uses a single-ended bus. The maximum bus length for this "fast"
device on a single-ended bus is 3 meters (9.8 feet). The internal cable length of the
jukebox is 1.5 meters (4.9 feet) which leaves 1.5 meters (4.9 feet) for the rest of the
bus.
Termination
•
Refer to the documentation that comes with your particular adapter to see how to
apply termination.
•
Use active terminators to reduce noise sensitivity.
•
Never terminate the bus at any place except the physical ends. Terminating the
bus in the middle will probably cause the bus to become inoperable or operate in
a state that could cause data loss.
•
If devices are on both sides of the host computer adapter (such as hard drives
internal to the host computer and a jukebox external to the host computer) make
sure that there is no termination on the host computer adapter. Termination must
be only on the device inside the computer that is farthest away (on the bus) from
the host adapter, and on the last physical device external to the computer.