User's Guide
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Differential SCSI cable lengths
. Make sure the total length of all
internal and external cables on the SCSI bus does not exceed 82 feet
(25.0 meters). If LVD devices are connected to the bus the total
length of all internal and external cables on the SCSI bus does not
exceed 41 feet (12.0 meters).
Internal cabling
. You must include the amount of internal cabling
in your calculations. See “Determining the cable length for each bus”
on page 136 for information.
If you have any other external devices on the bus (not installed inside
your host computer), these devices may have some amount of
internal SCSI cabling as well.
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If the library or any of the tape drives is the last device on the SCSI bus,
you must attach a terminator to the appropriate SCSI connector at the
back of the library. The SCSI terminator must match the SCSI bus
configuration (differential, wide) .
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Each device on the SCSI bus must have a unique ID. The host computer
uses these IDs to identify each device. The SCSI ID also determines
which device has priority when more than one device is trying to
communicate with the host. The lower the ID, the lower the priority of
the device.
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The SCSI ID does not depend on physical location. For example,
the last device on a multi-device SCSI bus can have a SCSI ID
of 2.