Avaya Communication Manager Administrator's Manual page 1802

Glossary and Abbreviations
H
ground-start trunk
A trunk on which, for outgoing calls, the system transmits a request for services to a distant switching
system by grounding the trunk ring lead. To receive the digits of the called number, that system
grounds the trunk tip lead. When the system detects this ground, the digits are sent.
GRS
Generalized Route Selection
GUI
graphical user interface
H
H0
An ISDN information transfer rate for 384-kbps data defined by CCITT and ANSI standards.
H11
An ISDN information transfer rate for 1536-kbps data defined by CCITT and ANSI standards.
H12
An ISDN information transfer rate for 1920-kbps data defined by CCITT and ANSI standards.
handshaking logic
A format used to initiate a data connection between two data module devices.
hertz (Hz)
A unit of frequency equal to one cycle per second.
HFAI
Hands Free Automatic Answer on Intercom
high-reliability system
A system having the following: two control carriers, duplicate expansion interface (EI) circuit packs
in the PPN (in G3r with CSS), and duplicate switch node clock circuit packs in the switch node (SN)
carriers. See also
system.
HNPA
See home numbering-plan area code
holding time
The total length of time in minutes and seconds that a facility is used during a call.
home numbering-plan area code (HNPA)
The local area code. The area code does not have to be dialed to call numbers within the local
geographical area.
hop
Nondirect communication between two switch communications interfaces (SCI) where the SCI
message passes automatically without intermediate processing through one or more intermediate
SCIs.
host computer
A computer, connected to a network, that processes data from data-entry devices.
hunt group
A group of extensions that are assigned the Station Hunting feature so that a call to a busy extension
reroutes to an idle extension in the group. See also
1802
duplicated common control, duplication,
(HNPA).
Administrator's Guide for Avaya Communication Manager
duplication option, and
ACD work mode.
critical-reliability
November 2003