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Glossary and Abbreviations
Issue 5 January 1998 GL-25555-230-024
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.
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 wireless 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.
IAS
Inter-PBX Attendant Service
ICC
Intercabinet cable or intercarrier cable