IBM System Storage TS3310 Setup And Operator Manual page 262

GBIC. Gigabit Interface Converter.
Gbi. gigabit
gigabit (Gbit). 1 000 000 000 bits.
gigabyte (GB). 1 000 000 000 bytes.
Gigabit Interface Converter (GBIC). Converts copper
interface to optic interface.
gnd. Ground.
H
hertz (Hz). Unit of frequency. One hertz equals one
cycle per second.
hex. Hexadecimal.
High Voltage Differential (HVD). A logic signaling
system that enables data communication between a
supported host and the library. HVD signaling uses a
paired plus and minus signal level to reduce the effects
of noise on the SCSI bus. Any noise injected into the
signal is present in both a plus and minus state, and is
thereby canceled. Synonymous with differential.
HVD. SCSI Bus High Voltage Differential
Hz . Hertz (cycles per second).
I
IBM Ultrium Tape Drive. Located within the library,
a data-storage device that controls the movement of the
magnetic tape in an IBM LTO Ultrium Tape Cartridge.
The drive houses the mechanism (drive head) that
reads and writes data to the tape.
ID. Identifier.
identifier (ID). (1) In programming languages, a
lexical unit that names a language object; for example,
the names of variables, arrays, records, labels, or
procedures. An identifier usually consists of a letter
optionally followed by letters, digits, or other
characters. (2) One or more characters used to identify
or name data element and possibly to indicate certain
properties of that data element. (3) A sequence of bits
or characters that identifies a program, device, or
system to another program, device, or system.
IML. Initial microprogram load.
initial microprogram load (IML) . The action of
loading a microprogram from an external storage to
writable control storage.
initiator. The component that executes a command.
The initiator can be the host system or the tape control
unit.
F-4
TS3310 Tape Library Setup and Operator Guide
INST. Installation.
interface. A shared boundary. An interface might be a
hardware component to link two devices or it might be
a portion of storage or registers accessed by two or
more computer programs.
interposer. The part used to convert a 68-pin
connector to a 50-pin D-shell connector.
intervention required. Manual action is needed.
INTRO. Introduction.
I/O. Input/output.
IOP. Input/output processor.
IPL. Initial program load.
ITST. Idle-time self-test.
K
kilogram (kg). One thousand grams (approximately
2.2 pounds).
km. kilometer. 1000 Meters, Approximately 5/8 mile.
L
LAN . Local area network. A computer network
within a limited area.
LCD. See liquid crystal display.
LED. Light-emitting diode.
Linear Tape-Open (LTO). A type of tape storage
technology developed by the IBM Corporation,
Hewlett-Packard, and Certance. LTO technology is an
"open format" technology, which means that its users
will have multiple sources of product and media. The
"open" nature of LTO technology enables compatibility
between different vendors' offerings by ensuring that
vendors comply with verification standards. The LTO
technology is implemented in two formats: the Accelis
format focuses on fast access; the Ultrium format
focuses on high capacity. The Ultrium format is the
preferred format when capacity (rather than fast access)
is the key storage consideration. An Ultrium cartridge
has a compressed data capacity of up to 800 GB (2:1
compression) and a native data capacity of up to 400
GB.
liquid crystal display (LCD). A low-power display
technology used in computers and other I/O devices.
loadable. Having the ability to be loaded.
LTO cartridge memory (LTO-CM). Within each LTO
Ultrium data cartridge, an embedded electronics and