I.2 Glossary
The glossary contains a list of abbreviations and definitions.
I.2.1 Abbreviations
Abbreviations as used in this manual are explained in the table below.
AC Alternating Current
DC Direct Current
CDM Call Data Management
DTMF Dual-tone multi-frequency signalling
ECR Engine Control Room
FSK Frequency Shift Keying
GPS Global Positioning System
GSM Global System for Mobile communications
IMO International Maritime Organization
LCD Liquid Cristal Display
PA Public Address
PBX Private Branch eXchange
PIN Personal Identification Number
PSTN Public Switched Telephone Network
PTT Push-To-Talk
RX Receiver
TX Transmitter
VHF Very High Frequency
I.2.2 Definitions
The meaning of standard definitions as used in this manual are explained in the table below.
AlphaConnect Alphatron brand name for the telephone exchanger system.
Dial Call (a telephone number) by turning a dial or using a keypad
Dual-tone multi-
frequency signaling
An in-band telecommunication signaling system using the voice-frequency band over
telephone lines between telephone equipment and other communications devices and
switching centers
Duplex A duplex communication system is a point-to-point system composed of two connected
parties or devices that can communicate with one another in both directions.
FleetBroadBand A maritime global satellite internet, telephony, SMS texting and ISDN network for ocean-
going ships using portable domed terminal antennas.
PA system An electronic sound amplification and distribution system with a microphone, amplifier, and
loudspeakers, used to allow a person to speak to a large public.
TalkBack A system of two-way communication by loudspeaker (also named semi duplex-conference).
8 | Preface
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