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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Glossary and Abbreviations
Page GL-25
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.
high-reliability system
A system having the following: two control carriers, duplicate expansion interface (EI) circuit packs
in the PPN (in R5r with CSS), and duplicate switch node clock circuit packs in the switch node (SN)
carriers. See also duplicated common control
, duplication, duplication option, and
critical-reliability system
.
HNPA
See home numbering-plan area code (HNPA)
.
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 ACD work mode
.
Hz
See hertz (Hz)
.
I
I1
The first information channel of DCP.