Lucent Technologies 8.2 User Manual

Page of 1707
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.