Codan Radio P25 Training Guide - Manual (Page 107)

P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 9: P25 Glossary of Terms Page 99
CHAPTER 9: P25 GLOSSARY OF TERMS
Access Method
The ability and means necessary
to store data, retrieve data, or
communicate with a system. FDMA,
TDMA and CDMA are examples.
ALGID
Abbreviation for the eight BITs which
identify the encryption algorithm in
systems with multiple encryption
algorithms.
Algorithm
A fi nite set of well defi ned rules for the
solution of a problem, in a fi nite number
of steps.
AMBE+2™
Abbreviation for “Advanced Multi Band
Excitation”. An enhanced Vocoder that
is backwards compatible with IMBE™.
APCO
Abbreviation for “Association of Public-
Safety Communication Offi cials”
APCO Project 16A
A suite of operational requirements
developed by APCO for Public Safety
trunked radio systems. It is titled “900
MHz Trunked Communications System
Functional Requirements Development,
Dated March 1979.”
ARQ
Automatic Retry Request to retry
corrupted data packets
ASCII
Abbreviation for “American Standard
Code for Information Interchange”
- A seven-BIT code that defi nes 128
characters, including control characters,
letters, numbers, and symbols.
Audio throughput delay
Waiting time delay from audio input
at sending unit until audio output at
receiving unit.
Backward Compatibility
Ability of new units to operate within an
“old” system infrastructure or to directly
intercommunicate with an “old” unit.
Bandwidth
The difference between the limiting
frequencies of a continuous frequency
band. Typically measured in Kilohertz.
May be considered the amount
in kilohertz required for a single
communications channel.
BCH
Abbreviation for “Bose-Chaudhuri-
Hocquenghem,” a binary coding
scheme.
BER
Abbreviation for “BIT Error Rate”