Codan Radio P25 Training Guide - Manual (Page 113)

P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 9: P25 Glossary of Terms Page 105
IRAC
Abbreviation for the Federal
Government “Interdepartmental Radio
Advisory Committee.”
ISDN
Abbreviation for “Integrated Services
Digital Network” All-digital network
handling a multiplicity of services with
standard interfaces for user access. An
integrated digital network in which the
same time-division switches and digital
transmission paths are used to establish
connections for different services.
ISO
Abbreviation for “International Standards
Organization”
Key
The parameter defi ning an encryption
code or method.
Key Tag
The parameter defi ning one of several
encryption codes or methods.
KID
Sixteen BITs which identify the
encryption key in systems with multiple
encryption keys.
LAN
Abbreviation for “Local Area Network.”
LC
Link Control information embedded in
digital voice
Linear Amplifi er
A radio fi nal amplifi er in which the output
is linearly proportional to the input.
Usually a class A amplifi er.
Linearized Amplifi er
A radio fi nal amplifi er in which the output
is mostly linearly proportional to the
input. Usually a class AB amplifi er.
LLC
Logical Link Control sublayer of the OSI
Data Link Layer
LMR
Abbreviation for “Land Mobile Radio”
Local Area Network (LAN)
A network covering small geographic
areas.
LSB
Abbreviation for “Least Signifi cant BIT.”
LSD
Low Speed Data embedded in digital
voice
LU
Abbreviation for “Logical Unit.”
MDT
Abbreviation for “Mobile Data Terminal”
MFID
Abbreviation for “Manufacturer’s
Identity.” An eight-BIT fi eld identifying
manufacturer of the radio equipment.
MI
Message Indicator to initialize encryption
MIB
Abbreviation for “Management
Information BITs.”
MIL-STD
Abbreviation for “Military Standard”.
MODEM
An acronym for MOdulator/
DEModulator. A device for converting
digital signals into quasi-analog
signals for transmission over analog
communications channels and for
reconverting the quasi-analog signals
into digital signals.
Modulation
A controlled variation of any property
of a carrier wave for the purpose of
transferring information.
MOS
Abbreviation for “Mean Opinion Score.”
An audio quality test.
MR
Mobile Radio, a reference designating a
mobile or portable subscriber unit
MSB
Abbreviation for “Most Signifi cant BIT.”