Compaq AA-RHGWB-TE manual Configuring a Shared Scsi Bus for Tape Drive Use

•Robotics control cables from each base module to the expansion unit: These cables have a DB-9 male connector on one end and a DB-9 female connector on the other end. Connect the male end to the Expansion Unit Interface connector on the base module and the female end to any Expansion Modules connector on the expansion unit.

_____________________ Note _____________________

It does not matter which interface connector a base module is connected to.

•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 BN21K (or BN21L) cable. Terminate the SCSI bus with an H879-AA terminator 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 BN21K (or BN21L) cables. Terminate the other DLT1 or DLT2 SCSI bus connection with an H879-AA terminator.

You can daisy chain between DLT1 and DLT2 (if present) with a

0.3-meter SCSI bus jumper (supplied with the TL891). Terminate the SCSI bus at the tape drive on the end of the shared SCSI bus with an H879-AA terminator.

____________________ 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 TZ89 tape drives be on a SCSI bus.

Figure 8–10 shows a MiniLibrary configuration with two TL892 DLT MiniLibraries and a TL890 DLT MiniLibrary expansion unit. The TL890 library robotics is on one shared SCSI bus, and the two TZ89 tape drives in each TL892 are on separate, shared SCSI buses. Note that the pass-through mechanism and cable to the library robotics motor is not shown in this figure.

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