
Glossary
Quantum PX720 User’s Guide 229
the millisecond of computer clock times in a network of
computers. Based on UTC, NTP synchronizes client workstation
clocks to the U.S. Naval Observatory Master Clocks in
Washington, DC and Colorado Springs CO. Running as a
continuous background client program on a computer, NTP
sends periodic time requests to servers, obtaining server time
stamps and using them to adjust the client's clock.
O
OCP (Operator Control Panel) The OCP acts as the main user interface for
the library. It consists of a viewing panel and 4 buttons allowing
the user to receive information and imput commands.
P
P7000 Identity When the library is in P7000 identity mode, the PX720 will
appear to the host as P7000 library. This is useful when a backup
package does not recognize the PX720 identity.
PCI The PCI bus typically runs at speeds of 33 MHz or 66 MHz and is
usually 32 bits wide. This means that it passes 32 bits of data
simultaneously as if down 32 separate wires. Some of the most
recent computers include "wider" 64-bit PCI buses, and already
certain very high-end video capture cards offer improved
performance if connected to a 64-bit PCI bus.
Petabyte A petabyte is equal to 1,024 terabytes or 2 to the 50th power
(1,125,899,906,842,624) bytes!
R
Robotics As used in the context of automated tape libraries; the X-axis,
Y-axis, and Z-axis mechanical assemblies inside the library used
to move tape cartridges.
RS-232C Short for Recommended Standard-232C, a standard interface
approved by the Electronic Industries Association (EIA) for
connecting serial devices. This standard is for ASYNCHRO-
NOUS TRANSFER between computer equipment and
accessories. Data is transmitted bit by bit in a serial fashion. The
RS-232 standard defines the function and use of all 25 pins of a
DB-25 type connector.
S
SCSI Small Computer System Interface. An American National
Standards Institute (ANSI) communications standard for
attaching peripheral equipment to computers.
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