AT&T 2400 manual Hard disk drive, Hardware, Header, Help, Hertz Hz, Host switch, Hunt group

Glossary

H

hard disk drive

A high-capacity data storage/retrieval device that is located inside a computer platform. A hard disk drive stores data on non-removable high-density magnetic media based on a predetermined format for retrieval by the system at a later date.

hardware

The physical components of a computer system. The central processing unit, disks, tape and floppy drives are all hardware.

header

Information that the system creates to identify a message. A message header includes the origi- nator or recipient, type of message, creation time, and delivery time.

help

A command run by pressing HELP or CTRL ? on an INTUITY display terminal to show the

options available at your current screen position. In the INTUITY AUDIX system, press	*	H on
the telephone keypad to get a list of options. See also on-line help.

hertz (Hz)

A measurement of frequency in cycles per second. A hertz is one cycle per second.

host switch

The switch directly connected to the INTUITY system over the data link. Also, the physical link connecting an INTUITY system to a distributed communications system (DCS) network.

hunt group

A group of analog ports on a switch usually administered to search for available ports in a circular pattern.

Hz

See hertz.

I

IDI

See isolating data interface.

INADS

See initialization and administration system.

information service

See bulletin board.

initialization

The process of bringing a system to a predetermined operational state. The start-up procedure tests hardware; loads the boot filesystem programs; locates, mounts, and opens other required filesystems; and starts normal service.

initialization and administration system (INADS)

A computer-aided maintenance system used by remote technicians to track alarms.

Issue 2 December 1995 GL-11