User Guide

Glossary 171
reprogrammed using a software utility.
FTP — File transfer protocol.
g — Gram(s).
G — Gravities.
Gb — Gigabit(s); 1024 megabits or 1,073,741,824 bits.
GB — Gigabyte(s); 1024 megabytes or 1,073,741,824 bytes. However, when referring
to hard-drive capacity, the term is usually rounded to 1,000,000,000 bytes.
graphics mode — A video mode that can be defined as x horizontal by y vertical pixels
by z colors.
host adapter — A controller that implements communication between the system’s
bus and the peripheral device, typically a storage device.
hot-swap — The ability to insert or install a device, typically a hard drive or an internal
cooling fan, into the host system while the system is powered on and running.
Hz — Hertz.
I/O — Input/output. A keyboard is an input device, and a monitor is an output device.
In general, I/O activity can be differentiated from computational activity.
iDRAC — Integrated Dell Remote Access Controller. A systems management hardware
and software solution that provides remote management capabilities, crashed system
recovery, and power control functions for Dell PowerEdge systems. "iDRAC6" refers to
this system’s specific implementation of the iDRAC solution.
IP — Internet Protocol.
IPv6 — Internet Protocol version 6.
IPX — Internet package exchange.
IRQ — Interrupt request. A signal that data is about to be sent to or received by a
peripheral device travels by an IRQ line to the processor. Each peripheral connection
must be assigned an IRQ number. Two devices can share the same IRQ assignment,
but you cannot operate both devices simultaneously.
iSCSI — Internet SCSI (see SCSI). A protocol that enables SCSI device
communication across a network or the Internet.
jumper — Small blocks on a circuit board with two or more pins emerging from them.
Plastic plugs containing a wire fit down over the pins. The wire connects the pins and
creates a circuit, providing a simple and reversible method of changing the circuitry in
a board.
K — Kilo-; 1000.
Kb — Kilobit(s); 1024 bits.