TMC Radio SRP 9100, Руководство по обслуживанию

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2 ~ SERVICE PHILOSOPHY
GLOSSARY OF TERMS
A summary of common radio terms and some other terms used in this document, and their meanings, are
given below.
3RP Trunking Signalling Specification relating to trunked networks for shared use. Used
primarily for networks in France.
ADC
Analogue to Digital Converter.
AFC Automatic Frequency Control.
AGC Automatic Gain Control.
Alarm A Selcall sequence sent from subscriber equipment to indicate an Emergency
situation.
When activated the radio will enter a repeating sequence consisting of an Alarm
Live Transmit Time and an Alarm Dead Receive Time.
ANN Abbreviation for Algorithmic Network Numbering. This is the numbering system
where the numbers presented to the radio user can be mapped directly to the
MPT1327 PFIX/IDENTs and vice versa by use of a fixed algorithm in combination
with some other customisation parameters. See also FPP and MEP.
ANI Automatic Number Identification.
Auto Interrogate
An Acknowledge identity sent as a response to an individual reset call.
Automatic Power Feature whereby the transmit power is automatically set to a level determined by
the level of the received signal. This is used to extend the battery life and/or
reduce radiated emissions.
Background Hunting
The searching for an alternative and 'better' control channel whilst already on a
valid control channel.
BCAST MPT1327 broadcast message. Used to transmit information about the trunked
radio system to radio units.
Busy The state of a channel such that:
•
For a non-signalling channel - if Busy this means that the carrier is above squelch.
•
For a channel with CTCSS/DCS - if Busy this means a signal is being received
with either no CTCSS tone / DCS code or the correct CTCSS tone /DCS code.
•
For a channel with Selcall - if busy this means a closed channel where the signal is
above squelch.
A feature that equates to 'Do Not Disturb' such that the radio will reject all non-
emergency calls. This feature can be activated using the busy key (if assigned) or
from a menu; it is reset to disabled at switch on.
C4FM Compatible 4-Level Frequency Modulation.
Call Back A request, sent by the dispatcher, to a unit requesting that the unit calls the
dispatcher back.
CCSC Control Channel System Codeword.
Channel Spacing The distance (in Hz) between the defined frequency channels.
CHEKKER System Interface Specification for Trunked Networks in Germany.