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NGT Transceiver System Technical Service Manual 11
Glossary
Term Means...
ACE A peripheral semiconductor device used to provide additional
serial interfaces to a microcontroller or digital signal processor.
AT commands A set of commands commonly used to operate many types of
modems.
CAN protocol A communication method that has good error-detection capabilities
and performs well in high-noise environments.
channel Frequencies programmed in the transceiver to transmit and receive
signals on air.
CHIRP A robust signalling protocol used by the HF Data Modem 3012
during link establishment.
coder/decoder A device combining an ADC and a DAC.
control site The site where the user or equipment that controls the system is
located.
data terminal
equipment
An RS232-related term indicating a PC or terminal.
digital signal
processor
A microprocessor-like device that is designed to process high-
volume digital data streams quickly.
Easitalk A feature that enables the user to reduce the level of background
noise that is present when listening to a channel.
effective
throughput
The average data transfer rate taking into account the effects of
data compression. For example, if system throughput is 1000 bps
and data compression reduces data size by 50%, the effective
throughput is 2000 bps.
first-in first-out A buffer used in serial communications devices to reduce CPU
overheads.
fixed base station A transceiver that is permanently installed and cannot be moved
without significant effort.
frequency The number of cycles per second of a radio wave, usually
expressed in kilohertz.
frequency offset The difference between the frequencies being used by a sending
and a receiving modem station. The variation is due to changes in
temperature, variations in power supply voltage or the aging of
components.
handset A hand-held device that is used to control the functions of a
transceiver. It consists of a microphone, PTT button, display and
keypad.
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