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Chapter 1. Introducing the DWZZH UltraSCSI Hub
EK–DWZZH–UG. D01 1–5
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
SCSI Addresses
The small UltraSCSI HUB does not use a SCSI ID.
The large UltraSCSI HUB uses SCSI ID 7 for
arbitration.
Overload Protection
DTERMPOWER
STERMPOWER
TERMPOWER is not supplied to the external ports
of the UltraSCSI HUB. Internal TERMPOWER is
protected via a resetable fuse. TERMPOWER must
be supplied from the remote connection to enable
each HUB port.
Shielding
Enclosure &
Connectors
Shielded for ESD, EMI, and safety requirements
Power-Up Reset Automatically clears
• Initiator detection circuit
• Target detection circuit
• BSY glitch filter
SCSI Bus Reset Automatically clears
• Initiator detection circuit
• Target detection circuit
• BSY glitch filter
Single-Ended SCSI Bus
Length
Ultra (20 megatransfers per
second or 40 MB/s)
20 meters (66 feet) per segment
Differential SCSI Bus Length 25 meters (82 feet) per segment
Data Timing The relationship between the data and the control
signals is brought to SCSI compatibility before
transmission to the other SCSI bus.
Design High reliability SMT