Glossary

gigabyte

GB. A unit of measure for data storage, equal to 1,073,741,824 bytes. Generally approximated as one billion bytes (D).

gigahertz

GHz. One billion cycles per second (Hertz) (D).

G_Port

See generic port.

graphical user interface

GUI. A visually oriented interface where the user interacts with representations of real-world objects displayed on the computer screen. Interactions with such objects produce actions that are intuitive to the user (D).

ground

That portion of a conducting circuit connected to the earth (D).

GSM card

A generic port (G_Port) module card containing shortwave laser ports for multimode fiber-optic cables.

GUI

See graphical user interface.

H

half duplex

The capacity to transmit in two directions, but not simultaneously.

hardware

Physical equipment (director, switch, or personal computer) as opposed to computer programs or software.

Hardware Log

Director or switch Hardware Log. Log displayed through the Product Manager application that provides a history of FRU removals and replacements (insertions) for an individual director or switch. The information is useful to maintenance personnel for fault isolation and repair verification. See also Audit Log; Event Log; Link Incident Log; Threshold Alert Log.

HBA

See host bus adapter.