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• Ensure that the W1 and W2 jumpers are installed to enable the
single-ended termination on one end of the bus.
___________________ Note ___________________
The RAID Array 310 SCSI bus converter board is the
same logic board used in the DWZZB signal converter.
2. Attach an H885-AA trilink connector to the SCSI input connector (on
the back of the cabinet).
3. Use a BN21K or BN21L cable to connect the trilink connector to a
trilink connector or BN21W-0B Y cable attached to a differential SCSI
controller, another storage shelf, or the differential end of a signal
converter.
4. Terminate the differential bus by attaching an H879-AA terminator to
the H885-AA trilink connector or BN21W-0B Y cable at each end of
the shared SCSI bus.
Ensure that all devices that make up the shared SCSI bus are connected,
and that there is a terminator at each end of the shared SCSI bus.
9.4.4 Cabling an HSZ40 or HSZ50 RAID Array Controller in a Radial
Configuration with an UltraSCSI Hub
You may have an HSZ40 or HSZ50 that you wish to keep when you upgrade
to a newer AlphaServer system. You can connect an HSZ40 or HSZ50 to an
UltraSCSI hub in a radial configuration, but even if the host bus adapter is a
KZPBA-CB, it will not operate at UltraSCSI speed with the HSZ40 or HSZ50.
To configure a dual-redundant HSZ40 or HSZ50 RAID array controller and
an UltraSCSI hub in a radial configuration, follow these steps:
1. You will need two H885-AA trilink connectors. Install an H879-AA
terminator on one of the trilinks.
2. Attach the trilink with the terminator to the controller that you want
to be on the end of the shared SCSI bus. Attach an H885-AA trilink
connector to the other controller.
3. Install a BN21K or BN21L cable between the H885-AA trilink
connectors on the two controllers. The BN21L-0B is a 0.15-meter cable.
4. If you are using a DS-DWZZH-05:
• Verify that the fair arbitration switch is in the Fair position to
enable fair arbitration (see Section 3.6.1.2.2)
• Ensure that the W1 jumper is removed to select wide addressing
mode (see Section 3.6.1.2.3)
9–28 Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices