Compaq AA-RHGWB-TE manual UltraSCSI Hubs, Vhdci Trilink Connector H8861-AA

Most devices have internal termination. For example, the UltraSCSI KZPBA-CB and the fast and wide KZPSA-BB host bus adapters have internal termination. When using a KZPBA-CB or KZPSA-BB with an UltraSCSI hub, ensure that the onboard termination resistor SIPs have not been removed.

You will need to provide termination at the storage end of one SCSI bus segment. You will install an H8863-AA trilink connector on the HSZ70 or HSZ80 at the bus end. Connect an H8861-AA terminator to the trilink connector to terminate the bus.

Figure 3–1 shows a VHDCI trilink connector (UltraSCSI), which you may attach to an HSZ70 or HSZ80.

Figure 3–1: VHDCI Trilink Connector (H8861-AA)

CXO5744A

3.6 UltraSCSI Hubs

The DS-DWZZH series UltraSCSI hubs are UltraSCSI signal converters that provide radial connections of differential SCSI bus adapters and RAID array controllers. Each connection forms a SCSI bus segment with SCSI bus adapters or the storage unit. The hub provides termination for one end

of the bus segment. Termination for the other end of the bus segment is provided by the:

•Installed KZPBA-CB (or KZPSA-BB) termination resistor SIPs

•External termination on a trilink connector attached to an UltraSCSI BA356 personality module (DS-BA35X-DA), HSZ70, or HSZ80

______________________ Note _______________________

The DS-DWZZH-03/05 UltraSCSI hubs cannot be connected to a StorageWorks BA35X storage shelf because the storage shelf does not provide termination power to the hub.

3–8Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware