Compaq AA-RHGWC-TE DS-DWZZH-03 Description, Shows a front view of the DS-DWZZH-03 UltraSCSI hub

•Require that termination power (termpwr) be provided by the SCSI bus host adapters on each SCSI bus segment.

_____________________ Note _____________________

The UltraSCSI hubs are designed to sense loss of termination power (such as a cable pull or termpwr not enabled on the host adapter) and shut down the applicable port to prevent corrupted signals on the remaining SCSI bus segments.

3.6.1.1 DS-DWZZH-03 Description

The DS-DWZZH-03:

•Is a 3.5-inch StorageWorks building block (SBB).

•Can be installed in:

–A StorageWorks UltraSCSI BA356 storage shelf (which has the required 180-watt power supply).

–The lower righthand device slot of the BA370 shelf within the RA7000 or ESA 10000 RAID array subsystems. This position minimizes cable lengths and interference with disks.

–A non-UltraSCSI BA356 which has been upgraded to the 180-watt power supply with the DS-BA35X-HH option.

•Uses the storage shelf only to provide its power and mechanical support (it is not connected to the shelf internal SCSI bus).

•Has three Very High Density Cable Interconnect (VHDCI) differential SCSI bus connectors.

•Does not use a SCSI ID.

•DS-DWZZH-03 and DS-DWZZH-05 UltraSCSI hubs may be housed in the same storage shelf with disk drives. Table 3–3 provides the supported configurations.

Figure 3–2 shows a front view of the DS-DWZZH-03 UltraSCSI hub.

Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware 3–9