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8.4.2 Cabling the Compaq 40/80-GB DLT Drive
The Compaq 40/80-GB DLT Drive is connected to a single-ended segment
of the shared SCSI bus. Figure 8–6 shows a configuration with a Compaq
40/80-GB DLT Drive for use on a shared SCSI bus.
To configure the shared SCSI bus for use with a Compaq 40/80-GB DLT
Drive, follow these steps:
1. You need one DWZZB-AA for each shared SCSI bus with a Compaq
40/80-GB DLT Drive.
Ensure that the DWZZB-AA 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. Connect an H885-AA trilink connector with attached H879-AA HD68
terminator to the differential end of the DWZZB-AA signal converter.
3. Connect a 328215-00X, BN21K, or BN21L cable between a Y cable or
trilink connector on one of the system host bus adapters and the open
connector on the trilink on the DWZZB-AA differential end. Keep the
total length of the differential segment below the 25-meter maximum
length. Ensure that the trilink or Y cable at both ends of the differential
segment of the shared SCSI bus is terminated with an HD68 differential
terminator such as an H879-AA.
4. Install a 152732-001 LVD terminator on one of the Compaq 40/80-GB
DLT Drive SCSI connectors. The LVD terminator works with either a
low voltage differential or a single-ended SCSI bus.
5. Connect one of the following HD68-to-HD68 cables between the other
Compaq 40/80-GB DLT Drive SCSI connector and the single-ended end
of the DWZZB-AA signal converter:
• 189646-001 (0.9-meter) or 189646-002 (1.8-meter) cable
• BN21K-01 or BN21L-01 (1-meter) cable
• BN21K-02 or BN21L-02 (2-meter) cable
This single-ended SCSI bus segment is limited to a maximum length of
3 meters (fast SCSI).
The single-ended SCSI bus may be daisy chained from one tape drive to
another with one of the cables listed in step 5 as long as you do not exceed the
single-ended SCSI bus maximum length of 3 meters. The distance includes
the length of both cables on the single-ended bus segment. Ensure that the
tape drive on the end of the bus is terminated with an LVD terminator.
Ensure that SCSI IDs for the tape drive and host bus adapter do not conflict.
Configuring a Shared SCSI Bus for Tape Drive Use 8–15