AT&T 2400 - Manual (Page 151)

Glossary
Issue 2 December 1995 GL-11
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 or on an INTUITY display terminal to show the
options available at your current screen position. In the INTUITY AUDIX system, press 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.
HELP CTRL ?
* H