June 2003 IPN: M5000-00-105 Glossary G - 3
Glossary
Note:
Note:Note:
Note: Terms that appear in italics are also
defined in this glossary.
active
The ‘on’ (asserted) state of a signal or indica-
tor.
ADC
Analog to digital converter. An electronic
device that outputs binary data dependant
upon the magnitude of voltage input.
ANR
Automatic Noise Reduction
brownout
A dip in the supply voltage sufficient to put the
control section into hardware reset.
calibration
The process of determining the calibration
data for a radio. Calibration is normally only
carried out during product manufacture or
major service.
calibration data
The set of coefficients for each of the electronic
tuning variables, as a function of frequency,
which allows the radio to calculate the configu-
ration data for any frequency it operates on.
The calibration data is unique for each radio.
call
A complete exchange of information between
two or more parties. In trunked mode, this may
occur on the control channel or on a traffic
channel.
CCTM
Computer controlled test mode. The operating
mode of the radio whereby computer equip-
ment can control various radio functions by
sending commands down a serial link to the
radio.
channel
A receive/transmit frequency pair.
chassis, old/new
See “New chassis” on page A-5 and “Accessory
connector compatibility” on page G-8
configuration
The determination and setup of the configura-
tion data for a given frequency from the
programmed calibration data (i.e. electronic
tuning).
configuration data
The data set corresponding to the value of the
electronic tuning variables on a given channel.
This is calculated for each frequency from the
calibration data.
control channel
The channel used by a trunking system to control
the radio.
conventional mode
The mode of operation whereby the radio
behaves as a conventional two-way radio (i.e.
non-trunked operation).
CTCSS
Continuous Tone Controlled Squelch System.
Continuous, subaudible coding on the channel
for the purpose of segregating user groups.
D-Clip
Accessory connector with protruding ‘D’
which allows the radio to be hung from a belt
loop (TOPA-CA-103). The new and old D-
Clips have different quarter turn tips. The old
D-Clip has hooks on the locating posts. The
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