Page 86 - Catalogue 2020 v.2.10

List of abbreviated terms used in this catalogue
DTMF encode
Dual Tone Multi-Frequency. The system used by touch-tone telephones. DTMF assigns a
specific code (consisting of two separate tones) to each key which makes it easily identified by a microprocessor
FFSK encoder
Fast Frequency Shift Keying. A modulation method in one of the first used data transmission forms
Changing tone frequencies for “1” and “0” are used, for instance when having 1200 bps (bit per second) “1” equals 1200Hz and “0” equals 1800Hz
Because of the used modulation form data transmission with FFSK is relatively slow
CTCSS
Continuous Tone Coded Squelch System. A tone Code (receiver and transmitter) also called “Pilot tone system” which uses low frequency tones between 67-254Hz. One tone from this tone row must be sent with the carrier to guard the channel. This specific tone must be present before the receiver is able to open the channel
CCIR
Comité Consultatif International des Radio communications. An organization which among other things standardizes tone rows for 5-tone systems
ZVEI
Zentralverband Elektrotechnik und Elektronikindustrie. An organization which among other things standardizes tone rows for 5-tone systems
GMSK
Gaussian Minimum Shift Keying. A modulation form for data communication. GMSK is a direct frequency change of the carrier frequency as function of digital signals “1” and “0”
The modulation signal is led through a Gaussian filter to limit the spectrum of unwanted signals
RXD
Data Receiver input. For instance the data receiving line in a serial interface
TXD
Data Transmitter output. For instance the data sending line in a serial interface
GPS
Global Positioning System. The American military satellite positioning system which is now available to the public
SMS
Short Message Service. A way to write short text messages between mobile deices
PSTN
Public Switched Telephone Network
PABX
Private Automatic Branch Exchange. A private leased control central which is used by many companies with several city lines and local lines
RAINWAT
RAINWAT is the “Regional Arrangement Concerning the Radiotelephone Service on Inland Waterways” which, through the Basel Arrangement has introduced and Automatic Transmitter Identification System (ATIS) for vessels making VHF transmissions whilst on the inland waterways of the signatory countries:
Austria; Belgium; Bulgaria; Croatia; Czech Republic; France; Germany; Hungary; Luxembourg; Moldova; The Netherlands; Poland; Romania; Slovakia; Switzerland; Serbia & Montenegro. 27/03/2009
SIMPLEX
RX & TX at the same frequency - transceiver can not send and receive at the same time
SIMPLEX/SEMI-DUPLEX
RX & TX is different frequencies - transceiver receives at one frequency and transmits on another.
DUPLEX
RX with its own frequency and antenna connection - RX with its own frequency and antenna connection. Transceiver with two antenna in/outputs. Can do both TX and RX in one cycle