Avaya DEFINITY Manual page 325

Glossary
H
HDD
Hard Disk Drive.
Heartbeat Indication
The status of the MAPD is indicated by two flashing buttons that appear on the faceplate panel
LCD of the system assembly.
Host
A computer, connected to a network, that processes data from data-entry devices.
I
IDE
Generic PC standard for interconnection of media devices to the PC motherboard.
Initialization
The process of bringing a system to a predetermined operational state. The start-up procedure
tests hardware and flashware; loads the boot file system programs, and locates, mounts, and
opens other required file systems; and starts normal service.
Integrated Services Digital Network (ISDN)
A public or private network that provides end-to-end digital communications for all services to
which users have access by a limited set of standard multipurpose user-network interfaces defined
by the CCITT. Through internationally accepted standard interfaces, ISDN provides digital cir-
cuit-switched or packet-switched communications within the network and links to other ISDNs to
provide national and international digital communications.
Internet Control Message Protocol (ICMP)
A standard that provides several diagnostic functions and can send error packets to hosts. ICMP
uses the basic support of IP and is an integral part of IP.
Internet Protocol (IP)
IP is a part of the TCP/IP family of protocols that describes software that tracks the Internet
address of nodes, routes outgoing messages, and recognizes incoming messages. In a gateway,
IP connects networks at OSI network Level 3 and above.
I/O
Input/Output. Two contexts: I/O functions on processor busses, and for the MAPD platform,
accesses to tip/ring type functions (for example, 10Base-T access) via the 50 pin designated
space in port carrier hardware.
ISA
Industry Standard Architecture.
Issue 3 May 2002 GL-5