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Glossary
Quantum PX720 User’s Guide 228
HVD High Voltage Differential or HVD (also called Differential SCSI).
The benefit of using HVD cabling is that it works well in noisy
areas and can reach up to 25 meters in distance. Quantum
DLT8000 and SDLT tape drives can be HVD or LVD devices.
I
IEC The International Electrotechnical Commission is based in
Geneva, Switzerland.
L
Load port The revolving assembly on a front door of enterprise libraries
that incorporates a revolving drum and tape cartridge slots
(stationary or removable) for loading and unloading tape
cartridges.
LTO Linear Tape-Open is a tape drive specification backed by IBM,
Hewlett-Packard, and Quantum.
LVD Low Voltage Differential or LVD is the newest type of SCSI
cabling, and LVD SCSI specifications can reach distances up to 12
meters. LVD SCSI cabling requires "Twist and Flat" ribbon cable
and an LVD/SE terminator or a "Twist and Flat" ribbon cable
with built-in LVD termination. All HP LTO-2 tape drives are
LVD devices. Quantum SDLT tape drives are also LVD devices.
M
MSBF Mean Swaps Before Failure
MTBF Mean Time Between Failures
MTTR Mean Time To Repair
N
NEMA National Electrical Manufacturers Association
Network interface Card (NIC) A NIC is a device that handles
communication between a device and other devices on a
network.
NVRAM Non-Volatile Random Access Memory is a type of memory that
retains its contents when power is turned off. One type of
NVRAM is SRAM that is made non-volatile by connecting it to a
constant power source such as a battery. Another type of
NVRAM uses EEPROM chips to save its contents when power is
turned off. In this case, NVRAM is composed of a combination of
SRAM and EEPROM chips.
NTP Short for Network Time Protocol, an Internet standard protocol
(built on top of TCP/IP) that assures accurate synchronization to
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