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8.5.2 Cabling the TZ885 Tape Drive
The TZ885 is connected to a single-ended segment of the shared SCSI
bus. It is connected to a differential portion of the shared SCSI bus with a
DWZZA-AA or DWZZB-AA. Figure 8–7 shows a configuration of a TZ885 for
use on a shared SCSI bus. To configure the shared SCSI bus for use with
a TZ885, follow these steps:
1. You will need one DWZZA-AA or DWZZB-AA for each TZ885 tape drive.
Ensure that the DWZZA jumper J2 or DWZZB jumpers W1 and W2 are
installed to enable the single-ended termination.
Remove the termination from the differential end by removing the five
14-pin SIP resistors.
2. Attach a trilink connector to the differential end of the DWZZA or
DWZZB.
3. Connect the single-ended end of a DWZZA to the TZ885 with a BC19J
cable.
Connect the single-ended end of a DWZZB to the TZ885 with a BN21M
cable.
4. Install an H8574-A or H8890-AA terminator on the other TZ885 SCSI
connector.
5. Connect a trilink or Y cable to the differential shared SCSI bus with
BN21K or BN21L cables. Ensure that the trilink or Y cable at the end
of the bus is terminated with an H879-AA terminator.
The single-ended SCSI bus may be daisy chained from one single-ended
tape drive to another with BC19J cables as long as the SCSI bus maximum
length is not exceeded. Ensure that the tape drive on the end of the bus is
terminated with a H8574-A or H8890-AA terminator.
You can add additional TZ885 tape drives to the differential shared SCSI
bus by adding additional DWZZA or DWZZB/TZ885 combinations.
8–18 Configuring a Shared SCSI Bus for Tape Drive Use