Compaq 4200 User Manual page 86

Glossary–10 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosures User Guide
Ultra SCSI
Ultra2 SCSI
units
universal AC input
power supply
VHDCI
wide SCSI bus
Wide-Ultra SCSI
Wide-Ultra2 SCSI
The Ultra SCSI improvements over Fast SCSI include the following:
• Maximum transfer rate increases from 10 MHz to 20 MHz.
• Maximum wide bus bandwidth increases from 20 MB/sec to
40 MB/sec.
• VHDCI (very high density cable interconnect) cables and connectors
are significantly thinner and smaller.
Also known as FAST 20.
A wide SCSI bus that transfers data at rates up to 80 Mbytes/sec (FAST
40) when operating as a low voltage differential bus. There is no
provision for this bus to operate in the narrow mode.
The modular unit "U" on which panel heights is based on the vertical
RETMA mounting pattern of 1.750 inches (44.45 mm). (Per EIA
Standard RS-310-C.)
A StorageWorks power supply that produces +5 V DC and +12 V DC
power from a range of AC input voltages and frequencies.
See also enclosure power supply.
Very High Density Cable Interconnect. A 68-pin interface with
connectors on 0.8 mm centers. Required for Wide-Ultra2 SCSI
configurations.
A parallel SCSI bus that transmits data over 16 lines.
A SCSI bus that can operate either as an LVD or SE bus. This bus
transfers data at rates up to 40 MB/s when using the LVD protocol. When
using SE the maximum transfer rate is 20 MB/s.
A wide SCSI bus that transfers data at rates up to 80 MB/s when
operating using the LVD protocol. There is no provision for this bus to
operate in the narrow mode.