Codan Radio P25 Training Guide - Manual (Page 114)

TRAINING GUIDE | P25 RADIO SYSTEMS
Chapter 9: P25 Glossary of Terms Page 106
MSK
Abbreviation for “Minimum Shift Keying.”
A form of frequency modulation in which
the modulating signal shifts the output
frequency between predetermined
values. Sometimes called fast frequency
shift keying.
NASTD
Abbreviation for “National Association of
State Telecommunications Directors.”
NCS
Abbreviation for “National
Communications Systems group” a U.S.
Federal agency.
NID
Network Identifi er code word following
the frame sync
NIST
Abbreviation for “National Institute of
Standards and Technology” a U.S.
Federal agency.
NPSPAC
Abbreviation for “National Public Safety
Planning Advisory Committee” A user/
industry advisory committee established
by the Federal Communications
Commission to develop a plan for
the use of the 800 MHz Public Safety
spectrum.
NSA
Abbreviation for the U.S. Federal
Government “National Security Agency.”
NTIA
Abbreviation for “National
Telecommunications and Information
Administration”. a U.S. Federal agency.
Octal
Base 8 notation for numbers, also called
radix 8
Octet
Eight BITs grouped together, also called
a byte
OFB
Abbreviation for a “Output Feedback.”
An encryption synchronization method.
Open System
A system whose characteristics comply
with specifi ed standards and that
therefore can be connected to other
systems that comply with these same
standards.
Open Systems Interconnection (OSI)
A logical structure for network operations
standardized within the ISO; a seven-
layer network architecture being used
for the defi nition of network protocol
standards to enable any OSl-compliant
computer or device to communicate
with any other OSl-compliant computer
or device for a meaningful exchange of
information
Operating System
An integrated collection of routines that
service the sequencing and processing
of programs by a computer. Includes
such functions as memory allocation,
fi le management, input and output
operations, communications and
interfacing to other application software.
OTAC
Abbreviation for “Over-The-Air-Control.”
OTAP
Abbreviation for “Over-The-Air-
Programming.”
OTAR
Abbreviation for “Over-The-Air-
Rekeying.”
Packet
A sequence of binary digits, including
data and control signals, that is
transmitted and switched as a
composite whole. The data, control
signals and possibly error control
information, are arranged in a specifi c
format.
Packet Switching
The process of routing and transferring
data by means of addressed packets
so that a channel is occupied during
the transmission of the packet only, and
upon completion of the transmission
the channel is made available for the
transfer of other traffi c.