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DWZZH 16-Bit UltraSCSI Hub
User’s Guide
EK–DWZZH–UG. D01
Compaq Computer Corporation
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Fourth Edition, November 1998 While Compaq Computer Corporation believes the information included in this manual is correct as of the date of publication, it is subject to change without notice. Compaq makes no representations that the interconnection of its products in the manner described in this document will not infringe existing or future patent rights, nor do the descriptions contained in this document imply the granting of licenses to make, use, or sell equipment or software in accordance
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Achtung! Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer für entsprechende Gegenmaßnahmen verantwortlich ist. Attention! Ceci est un produit de Classe A. Dans un environnement domestique, ce produit risque de créer des interférences radioélectriques, il appartiendra alors à l’utilisateur de prendre les mesures spécifiques appropriées. JAPAN USA This equipment generates, uses, and ma
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Contents Revision Record………………………………………………………………..vii About This Guide………………………………………………………….…...ix 1 Introducing the DWZZH UltraSCSI Hub 1.1 UltraSCSI Hub Functions ......................................................................................1–1 1.2 Product Descriptions...............................................................................................1–2 1.2.1 DWZZH 3.5" SBB Hubs...................................................................................1–2 1.2.2 DW
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DWZZH 16-Bit UltraSCSI Hub Figures (Cont’d) 3–1 Running One SWCC Agent for a Particular Storage Subsystem .............................3–3 Tables 1–1 DWZZH Hub Functional Specifications..................................................................1–5 2–1 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves ...............2–8 vi EK–DWZZH–UG. D01
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Revision Record The Revision Record provides a concise publication history of this guide. It lists the guide revision levels and release dates, and summarizes the changes. The following revision history lists all revisions of this publication and their effective dates. The publication part number is included in the Revision Level column, with the last entry denoting the latest revision. This publication supports the DWZZH 16-Bit UltraSCSI Hub. Revision Level Date Summary of Changes EK–DWZZH–UG.
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DWZZH 16-Bit UltraSCSI Hub EK–DWZZH–UG. D01 October 1998 Change Section 2.1, add CAUTION after Section 2.1. Make minor changes to Section 2.3.3; renumber Section 2.3.3 as Section 2.3. Renumber Sections 2.3, 2.4, 2.5, and 2.6 as 2.4, 2.5, 2.6, and 2.7, respectively. viii EK–DWZZH–UG. D01
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About This Guide This chapter tells you what this User’s Guide does, identifies the audience, describes the structure and contents (chapter-by-chapter) briefly, and tells you how to get support and services from Compaq. This User’s Guide describes the purpose, function, operation, and use of the DWZZH UltraSCSI Hub (the DWZZH Hub or the Hub). The DWZZH Hub allows the connection of up to five ports on one logical SCSI bus. Visit our Web Site for the Latest Information Check our web site for the l
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DWZZH 16–Bit UltraSCSI Hub Document Structure This guide contains the following chapters: Chapter 1. Introducing the DWZZH UltraSCSI Hub This chapter gives brief functional and physical descriptions of the DWZZH Hub and lists significant product specifications. Chapter 2. Using the DWZZH UltraSCSI Hub This chapter gives the procedures for configuring a StorageWorks SCSI bus using a DWZZH Hub. Chapter 3. SWCC and UltraSCSI Hubs This chapter provides important information concerning the use of
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About This Guide Who to contact in Europe Information and Product Questions, Contact the Compaq Distributor or reseller Installation Support, and Installation: from whom the Storage Solution was purchased. For Warranty Service See the Warranty Card packaged with the product. For Remedial Service Contact the Compaq Distributor or reseller from whom the Storage Solution was purchased. Note: A Service Contract is recommended when the equipment is out of warranty. Who to contact in Asia Pacific For
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1 Introducing the DWZZH UltraSCSI Hub This chapter describes the DWZZH Hub functions and available versions, and list the Hub functional specifications. The series of DWZZH Hubs are SCSI–2 and draft SCSI–3 (ANSI X379.2/91–10R3) compliant 16-bit converters capable of data transfer rates of up to 40 Mbytes per second. The series of Hubs consists of the following: • DWZZH–21 and DWZZH–03 are 3.5" SBB (small) Hubs; the DWZZH–21 contains two single-ended and one differential UltraSCSI ports, while th
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DWZZH 16-Bit UltraSCSI Hub 1.2 Product Descriptions There are two classes of DWZZH Hubs: 3.5" SBB Hubs, and 5.25" SBB Hubs. 1.2.1 DWZZH 3.5" SBB Hubs The DWZZH small UltraSCSI Hub (Figure 1-1) comes in two versions. • DWZZH-21 contains two single–ended UltraSCSI connectors and one differential UltraSCSI connector; Figure 1-2 illustrates the front panel. • DWZZH-03 contains three differential UltraSCSI connectors; Figure 1-3 illustrates the front panel. CAUTION Connecting a differential
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Chapter 1. Introducing the DWZZH UltraSCSI Hub Figure 1–2 DWZZH–21 Front Panel NOTE The single–ended symbol with the downward– pointing diamond in Figure 1-2 indicates that the lower two connectors are single–ended UltraSCSI connections, while the differential symbol with the right–pointing diamond indicates that the top connector is a differential UltraSCSI connector. Figure 1–3 DWZZH–03 Front Panel NOTE The differential symbol in Figure 1-3 indicates that the three connectors
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DWZZH 16-Bit UltraSCSI Hub 1.2.2 DWZZH 5.25" SBB Hubs The DWZZH large UltraSCSI Hub (Figure 1-4) comes in a single version that contains five differential UltraSCSI bus connectors. CAUTION Connecting a single-ended bus cable to any differential connector causes the SCSI bus to fail. Figure 1–4 DWZZH–05 5.25" SBB Hub 1.2.3 SCSI Bus Components To install a DWZZH UltraSCSI Hub you will need BN37A and BN38C series SCSI cables. Refer to the StorageWorks UltraSCSI Configuration Guidelin
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Chapter 1. Introducing the DWZZH UltraSCSI Hub 1.3 Product Specifications Table 1-1 lists the functional specifications for the DWZZH Hub. Table 1–1 DWZZH Hub Functional Specifications Feature Specification SCSI ID The small UltraSCSI HUB does not use a SCSI ID. SCSI Addresses The large UltraSCSI HUB uses SCSI ID 7 for arbitration. Overload Protection TERMPOWER is not supplied to the external ports DTERMPOWER of the UltraSCSI HUB. Internal TERMPOWER is STERMPOWER protected via a reseta
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DWZZH 16-Bit UltraSCSI Hub Table 1–1 DWZZH Hub Functional Specifications (Cont’d) Feature Specification Cable Fault DIFFSENSE support and port disable on cable fault Glitch Elimination 100% glitch free operation during power-up BUSY GLITCH trap eliminates cable length constraint due to wired-OR glitches on the BSY line Termination Singled-ended Active termination for 16bit operation. Differential Termination for 16bit operation. Service There are no user servicable functions on these prod
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2 Using the DWZZH UltraSCSI Hub This chapter discusses fair arbitration of the SCSI bus by the 5.25" SBB Hub, describes addressing configurations, tells you how to use the large Hub front panel, and gives guidelines for selecting the SCSI cables. UltraSCSI Configuration guidelines are documented in EK-ULTRA-CG. These guidelines include a list of all UltraSCSI components and the last few example configurations include an UltraSCSI Hub. Refer to the configuration guidelines for bus length and SCSI
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DWZZH 16–Bit UltraSCSI Hub removed from the group and at the next arbitration phase, the remaining highest ID will be serviced. This will continue until all of the IDs in the group have been serviced once. All requests from IDs not contained in the register will be “backed off ” using ID 7. CAUTION Most manufacturers ship host bus adapters with a default SCSI ID of 7. Ensure that the ID is changed BEFORE you establish a connection between the adapter and the Hub. After all the IDs in the group
