Summary of Contents for StorageWorks DWZZH
- Page 1 DWZZH 16–Bit SCSI Bus Hub User’s Guide EK–DWZZH–UG. B01 Digital Equipment Corporation Maynard, Massachusetts...
- Page 2 Consult the dealer or an experienced radio/TV technician for help This equipment requires the use of shielded SCSI cables such as the Digital Equipment Corporation BN37A-series. StorageWorks and the DIGITAL logo are trademarks of Digital Equipment Corporation. Copyright © 1998 Digital Equipment Corporation...
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Page 3: Table Of Contents
Determining the Configuration ................2–6 Selecting the SCSI Cables ..................2–6 Glossary Figures 1–1 DWZZH–21 or DWZZH-03 SCSI Bus Hub ............1–2 1–2 DWZZH–21 Front Panel ..................1–3 1–3 DWZZH–03 Front Panel ..................1–3 1–4 DWZZH–05 SCSI Bus Hub..................1–4 2–1 DWZZH–05 SCSI ID Assignments ................ -
Page 5: Revision Record
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 SCSI Bus Hub. -
Page 7: About This Guide
DIGITAL. This User’s Guide describes the purpose, function, operation, and use of the DWZZH 16-Bit SCSI Bus Hub (the DWZZH Hub or the Hub). The DWZZH Hub allows the connection of up to five ports on one logical SCSI bus. - Page 8 Document Structure This guide contains the following chapters: Chapter 1. Introducing the DWZZH Hub This chapter gives brief functional and physical descriptions of the DWZZH Hub and lists significant product specifications. Chapter 2. Using the DWZZH Hub This chapter gives the procedures for configuring a StorageWorks SCSI bus using a DWZZH Hub.
- Page 9 Storage Solution was purchased. Note: A Service Contract is recommended when the equipment is out of warranty. Who to contact in Asia Pacific For all services, contact the DIGITAL Distributor or reseller from whom the equipment was purchased. EK–DWZZH–UG. B01...
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Page 11: Scsi Bus Hub Functions
Introducing the DWZZH 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: •... -
Page 12: Product Descriptions
DWZZH 16-Bit SCSI Bus Hub Product Descriptions There are two classes of DWZZH Hubs: 3.5" SBB Hubs, and 5.25" SBB Hubs. 1.2.1 3.5" SBB Hubs The DWZZH small SCSI Hub (Figure 1-1) comes in two versions. • DWZZH-21 contains two single–ended SCSI bus connections and one differential SCSI connection;... - Page 13 Chapter 1. Introducing the DWZZH 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 SCSI connections, while the differential symbol with the right–pointing diamond indicates that the top connector is a differential SCSI connection.
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Page 14: Scsi Bus Components
DWZZH 16-Bit SCSI Bus Hub 1.2.2 5.25” SBB Hubs The DWZZH large SCSI Hub (Figure 1-4) comes in a single version that contains five differential SCSI bus connections. CAUTION Connecting a differential bus cable to the single- ended connector, or a single-ended bus cable to the differential connector causes the SCSI bus to fail. -
Page 15: Product Specifications
Chapter 1. Introducing the DWZZH Hub 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 SCSI HUB does not use a SCSI ID (small HUB) SCSI Addresses The large SCSI HUB uses SCSI ID 7 for arbitration. - Page 16 DWZZH 16-Bit SCSI Bus 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...
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Page 17: Large Hub Fair Arbitration
SCSI Hub. Refer to the configuration guidelines for bus length and SCSI bus data transmission rates. The UltraSCSI Hubs are designed to be installed in StorageWorks Solutions BA350 and BA356 Shelfs. The small SCSI Hub may be installed in any open SBB slot. -
Page 18: Large Hub Addressing Configurations
DWZZH 16–Bit SCSI Bus Hub After all the IDs in the group have been serviced, a new group of IDs will be captured at the next arbitration phase. The fair arbitration algorithm only applies to host port SCSI IDs as defined by the assignment in each configuration. -
Page 19: Dwzzh–05 Scsi Id Assignments
Chapter 2. Using the DWZZH Hub Figure 2–1 DWZZH–05 SCSI ID Assignments C on tro lle r P ort H o st P o rt H o st P o rt S C S I ID 6-0 S C S I ID 15... -
Page 20: Front Panel
DWZZH 16–Bit SCSI Bus Hub Front Panel Figure 2-2 shows the location of the front panel controls and indicators. Figure 2–2 DWZZH–05 Front Panel Fa ir D isa ble P o w er B u sy S H R -10 7 0... -
Page 21: Indicators
Hub (Figure 2-4) must be installed to make the Hub respond to SCSI IDs 3 – 0 on the host ports. Figure 2–3 DWZZH–05 SCSI Narrow ID Assignments C on tro lle r P o rt H ost P ort... -
Page 22: Determining The Configuration
All SCSI buses are terminated at the physical ends of the bus. This is true even when using a DWZZH SCSI Hub. DWZZH SCSI Hubs are factory set to terminate the SCSI bus. No user configuration of the SCSI terminators is required. - Page 23 A signal's level is determined by the potential difference between two wires. A differential bus is more robust and less subject to electrical noise than is a single-ended bus. DWZZC A StorageWorks compatible 16-bit SCSI bus converter. See SCSI bus converter. DWZZH A StorageWorks compatible 16-bit SCSI bus HUB.
- Page 24 5¼-inch carrier is considered to be an SBB, whether it is a storage device, a power supply, or other device. SBB shelf The common name for any StorageWorks shelf that contains only power supply and storage SBBs. SCSI Small Computer System Interface. This ANSI interface defines the physical and electrical parameters of a parallel I/O bus used to connect computers and devices.
- Page 25 The Digital set of enclosure products that allows customers to design and configure their own storage subsystem. Components include power, packaging, and interconnections in a StorageWorks shelf. SBBs and array controllers are integrated therein to form level enclosures to house the shelves. Standard mounting devices for SBBs are also included.
- Page 27 Reader’s Comments Manual Order Number: EK–DWZZH–UG. B01 DIGITAL is committed to providing the best products and services. Since our manuals are important components of our products, we value your comments, corrections, and suggestions for improvements. Please take a few minutes to fill out and return this form.
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