Compaq DWZZH manual Front Panel, Fair Arb Disable

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DWZZH 16–Bit UltraSCSI Hub

2.4Front Panel

Figure 2-4 shows the location of the front panel controls and indicators.

Figure 2–4 DWZZH–05 Front Panel

Fa ir	D isa ble
	P o w er
	B u sy
	S H R -1070

NOTE

The black part of the switch in the diagram indicates the position of the switch.

2.4.1 Fair Arb Disable

The large Hub contains a switch on the front panel that allows the user to disable the FAIR ARB feature of the Hub. When FAIR ARB is disabled, the Hub services SCSI arbitration cycles in the conventional SCSI priority order. Host port SCSI ID assignments are not linked to the physical port location in the Hub when FAIR ARB is disabled.

2–6	EK–DWZZH–UG. D01

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Contents Dwzzh 16-Bit UltraSCSI Hub Fourth Edition, November Japan Page Contents Figures Cont’d TablesRevision Record Revision Level Date Summary of ChangesEK- DWZZH-UG. D01 About This Guide Visit our Web Site for the Latest InformationAudience Related DocumentationSupport and Services Who to contact in the Americas Document StructureWho to contact in Europe Who to contact in Asia PacificPage Introducing the Dwzzh UltraSCSI Hub UltraSCSI Hub FunctionsProduct Descriptions Dwzzh 3.5 SBB HubsDWZZH-21 Front Panel Dwzzh 5.25 SBB Hubs Scsi Bus ComponentsProduct Specifications Lists the functional specifications for the Dwzzh HubDwzzh Hub Functional Specifications Cont’d Feature Using the Dwzzh UltraSCSI Hub Large Hub Fair ArbitrationLarge Hub Addressing Configurations Narrow Addressing Setting DWZZH-05 Scsi ID AssignmentsDWZZH-05 Scsi Narrow ID Assignments W1 To enable narrow addressing mode, install a jumper at W1 Fair Arb Disable Front PanelIndicators Determining the ConfigurationPlacement of UltraSCSI Hubs Selecting the Scsi CablesNot installed Swcc and UltraSCSI Hubs Agents and StorageDwzzh 16-Bit UltraSCSI HUB DWZZH-05 Page Glossary ControllerSBB Scsi end-bus position Very High Density Cable Interconnect