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N
N/A. Not applicable.
native storage capacity. The amount of data that can
be stored without compression on a tape cartridge.
native sustained data transfer rate. See data
transfer rate.
negotiated speed. Defined by Fibre Channel
Standards, the algorithm that ensures the highest speed
that is supported by both the Ultrium 2 Tape Drive and
the port to which it attaches. This negotiation occurs at
power up and whenever a catastrophic link event
occurs, such as a cable pull that exceeds the timeouts
that are specified in the Standards. The speed is
negotiated when the first possibility of a new connection
(for example, a fiber cable) is established, and is
maintained until the Fibre Channel connection is
terminated. The speed is not renegotiated when a new
device is attached to a loop.
network. A configuration of data processing devices
and software that is connected for information
interchange.
network server. In a local area network, a personal
computer that provides access to files for all of the
workstations in the network.
node. In Fibre Channel technology, a communicating
device.
N_port. Located on the Ultrium 2 Tape Drive, the Fibre
Channel portal that facilitates communication only in a
point-to-point topology. An N_port also allows
connection to F_ports.
NL_port. Located on the Ultrium 2 Tape Drive, the
Fibre Channel portal that facilitates communication only
in a point-to-point topology (by acting as an N_port). If
the connection fails, the port attempts to connect in an
FC-AL topology (by acting as an L_port).
ntutil. Created by IBM, a utility program for LTO
devices that connect to Windows NT and Windows
2000. ntutil provides problem determination for
hardware or connections, assists with device and
medium changer recognition, forces dumps, loads new
firmware, sends and receives SCSI commands to and
from the hardware, and obtains SCSI sense data to use
in resolving errors.
O
oersted. The unit of magnetic field strength in the
unrationalized centimeter-gram-second (cgs)
electromagnetic system. The oersted is the magnetic
field strength in the interior of an elongated, uniformly
wound solenoid that is excited with a linear current
density in its winding of one abamper per 4π
centimeters of axial length.
offline. The operating condition that the Ultrium 2 Tape
Drive is in when the server’s applications cannot interact
with it.
online. The operating condition that the Ultrium 2 Tape
Drive is in when the server’s applications can interact
with it.
Open Systems. Computer systems whose standards
are not proprietary.
operating environment. The temperature, relative
humidity rate, and wet bulb temperature of the room in
which the Ultrium 2 Tape Drive routinely conducts
processing.
operating system. The master computer control
program that translates the user’s commands and
allows software application programs to interact with the
computer’s hardware.
optical transceiver. A device that both transmits and
receives analog or digital signals over a light source.
P
panic reset. The act of pressing and holding the
unload button for 10 seconds to force a reset of a
nonresponsive drive.
parity. The state of being even-numbered or
odd-numbered. A parity bit is a binary number that is
added to a group of binary numbers to make the sum of
that group always odd (odd parity) or even (even parity).
parity error. A transmission error that occurs when the
received data does not have the parity that is expected
by the receiving system. This usually occurs when the
sending and receiving systems have different parity
settings.
point-to-point connection. Pertaining to data
transmission between two locations without the use of
any intermediate display station or computer.
port. (1) A system or network access point for data
entry or exit. (2) A connector on a device to which
cables for other devices such as display stations and
printers are attached. (3) The representation of a
physical connection to hardware. A port is sometimes
referred to as an adapter; however, there can be more
than one port on an adapter.
power connector. Located at the rear of the Ultrium 2
Tape Drive, the connector to which the internal power
cable of an enclosure connects.
power cord. A cable that connects a device to a
source of electrical power.
Glossary 111