HP b1000 manual Scsi Bus Differences, Cable Length Physical Rate Addresses Location

SCSI Connections

SCSI Bus Differences

SCSI Bus Differences

A Small Computer Systems Interface (SCSI) bus is an IEEE standard bus for connecting your workstation to internal and external devices (SCSI devices) running at different speeds. There may be one device connected to the external SCSI port or several SCSI devices may be daisy chained together and connected to the external SCSI port. Examples of these SCSI devices are 4-mm DDS-format tape drives and hard disk drives.

There are two types of SCSI buses available with this workstation—an Ultra Narrow Single-Ended SCSI bus (NSE SCSI), and an Ultra2 Wide Low-Voltage Differential SCSI bus (LVD SCSI). The following table shows the specification differences between these SCSI buses.

CAUTIONCurrently Hewlett-Packard does not support mixing Ultra Narrow Single-Ended and Ultra2 Wide Low-Voltage Differential devices on any one bus type.

Table 4-1		SCSI Bus Differences
	Type	Data	Data Bus	Available	Maximum	Device
		Transfer	Width	SCSI	Cable Length	Physical
		Rate		Addresses1		Location2
	Ultra Narrow	Up to 20	8 bits	0 through 6	3.0 meters	External
	Single-Ended	Mbytes/sec			(9.84 feet)
	Ultra2 Wide	Up to 80	16 bits	0 through 6; 8	12 meters	Internal and
	Low-Voltage	Mbytes/sec		through 15	(39.37 feet)	external
	Differential

1.Address 7 is reserved for host controller use on all buses.

2.This information is specific to the HP V ISUALIZE B1000/C3000 computer.

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