ADIC Scalar AIT 440, Installation And Operating Manual

Page: 175 / 205

Chapter 11
152 Scalar AIT 440/480
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Single-ended and differential Wide Ultra SCSI devices. If the
library is equipped with AIT-2 drives, the devices (including cables
and terminators) may be HVD, LVD, or Single-ended LVD Wide
Ultra SCSI. If using an HVD Wide Ultra SCSI bus, all devices must
be HVD Wide Ultra SCSI. If using an LVD Wide Ultra SCSI bus,
all devices should be LVD Wide Ultra SCSI, however, if any
single-ended device is attached to the LVD bus, the entire bus will
switch to single-ended mode.
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Narrow SCSI-2 and Wide SCSI-2 . If the library is equipped with
AIT-1 drives, make sure all devices within the library are Wide
SCSI-2. Do not mix Narrow SCSI-2 and Wide SCSI-2 devices
within the library.
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Differential SCSI-2 cable lengths. Make sure that the total length
of all internal and external cables on the SCSI-2 bus does not exceed
25.0 meters (82 feet). See
page 159 for instructions for calculating
the total cable length.
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Wide Ultra SCSI cable lengths. Make sure that the total length of
all internal and external cables on the SCSI bus should not exceed
25.0 meters (82 feet) if HVD and 12 meters (41 feet) if LVD. If an
LVD bus is used, and a single-ended device is attached, the entire
bus switches to single-ended mode. In this instance, the total length
of all internal and external cables on the SCSI bus should not exceed
1.5 meters (4.9 feet) if five or more devices are attached, and 3 meters
(9.8 feet) if four or less devices are attached. See
page 159 for
instructions for calculating the total cable length.
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Termination. All termination must be external. It is necessary to
use a passive terminator on all differential buses.
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SCSI bus connections. Make sure that all SCSI cables and
terminators are securely connected to the appropriate SCSI
connectors on the back of the library. See
page 25 for more
information.