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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Glossary and abbreviations
1636
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 G3r 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.
I2
The second information channel of DCP.
I2 Interface
A proprietary interface used for the DEFINITY Wireless Business System for the radio-controller circuit
packs. Each interface provides communication between the radio-controller circuit pack and up to two wire-
less fixed bases.
I3 Interface
A proprietary interface used for the DEFINITY Wireless Business System for the cell antenna units. Each
wireless fixed base can communicate to up to four cell antenna units.