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connector on the data unit and the female end to any Expansion Modules
connector on the expansion unit.
_____________________ Note _____________________
It does not matter which interface connector you connect to
a base unit or a data unit.
• SCSI bus connection to the expansion unit robotics: Connect the shared
SCSI bus that will control the robotics to one of the SCSI connectors
on the expansion unit with a 328215-00X, BN21K, or BN21L cable.
Terminate the SCSI bus with an HD68 terminator (such as an H879-AA)
on the other expansion unit SCSI connector.
• SCSI bus connection to each of the base module tape drives: Connect a
shared SCSI bus to one of the DLT1 or DLT2 SCSI connectors on each of
the base modules with 328215-00X, BN21K, or BN21L cables. Terminate
the other DLT1 or DLT2 SCSI bus connection with an HD68 terminator
(H879-AA).
You can daisy chain between DLT1 and DLT2 (if present) with a
0.3-meter SCSI bus jumper (supplied with the TL881 or TL891).
Terminate the SCSI bus at the tape drive on the end of the shared SCSI
bus with an HD68 terminator (H879-AA).
____________________ Notes ____________________
Do not connect a SCSI bus to the SCSI connectors for the
library connectors on the base modules.
We recommend that no more than two tape drives be on
a SCSI bus.
Figure 8–19 shows a TL891 DLT MiniLibrary configuration with an
expansion unit, a base units, and a data unit. The library robotics expansion
unit is on one shared SCSI bus and the two tape drives in the base unit are
on separate, shared SCSI buses. The data unit is not on a shared SCSI bus
as it does not contain any tape drives but tape cartridges only. Note that
the pass-through mechanism and cable to the library robotics motor is not
shown in this figure.
For more information on cabling the units, see Section 8.12.2.1.2. With the
exception of the robotics control on the expansion module, a rackmount
TL881 or TL891 DLT MiniLibrary is cabled in the same manner as a
tabletop unit.
8–68 Configuring a Shared SCSI Bus for Tape Drive Use