96122 • Revision: F 7
CHAPTER
2
SCSI Bus Physical Description
This chapter contains the physical description for the small computer system
interface (SCSI) bus for the SL500 library, including:
■ Characteristics
■ Interface cables
■ Special signals
■ P-cable to A-cable adapters
Characteristics
The library supports single-ended/LVD (low-voltage differential) for the SCSI bus
connection. The following paragraphs describe the characteristics for these
alternatives.
The single-ended alternative has the following characteristics:
■ Maximum cable length of 3 m (9.8 ft)
■ Minimum cable length of 0.3 m (1 ft)
■ Primarily for connections within a cabinet
■ 0.1 m (4 in.) stubs (the distance from the on-board device to the bus)
■ Twisted-pairs cables (sometimes)
■ Less power than the differential alternative
■ Low cost
■ Lower performance data rates than LVD
The LVD alternative has the following characteristics:
■ Maximum cable length of 12 m (39.4 ft)
■ Minimum cable length of 0.36 m (14.2 in.)
■ 0.1 m (4 in.) stubs (the distance from the on-board device to the bus)
■ Usable for outside cabinet connections
■ LVD- or Universal-rated cables
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