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What are the two parallel SCSI specifications? (Choose two.)
A. Up to 25 m bus length
B. Only one device per SCSI bus
C. Up to 16 devices per SCSI bus
D. Half-duplex operation
E. Full-duplex operation
Correct Answer: AC
Explanation/Reference:
Explanation:
There are several revisions of the SPI document. SPI includes Fast SCSI data transfer speeds up to 10 Megatransfers (20 Mbytes/sec for 16-bit). The Ultra SCSI (Fast-20) modification of SPI includes doubling the data throughput to 20 Megatransfers/sec (40 Mbytes/sec for 16-bit). Ultra SCSI speeds reduce the maximum single-ended cable length to 1.5 m (5 ft) with 5 or more devices and 3 m (10 ft) for systems having up to 4 devices. The maximum recommended differential cable length remains at 25 m (82 ft).
Reference: http://en.wikipedia.org/wiki/SCSI#Parallel_SCSI
