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ACRONYMS AND ABBREVIATIONS
A
AC ........................................................................................................... Alternating Current
ACK........................................................................................................... Acknowledgement
AFC.........................................................................................Automatic Frequency Control
AGC................................................................................................. Automatic Gain Control
ALM ...............................................................................................................................Alarm
AMVER............................................. Automated Mutual-assistance Vessel Rescue system
A vessel position-reporting system operated by the United States Coast Guard for any
merchant vessel of 1000grt or more on a voyage lasting longer than 24 hours, to and
from anywhere on the world.
ANSI ......................................................................... American National Standard Institute
Answerback:
An identifier given to an Inmarsat MES and used in message transmissions. The format
must be four letters (A-Z; no numbers) finishing with an x.
ANT ............................................................................................................................ Antenna
AOR.................................................................................................... Atlantic Ocean Region
AOR-E.................................................................................... Atlantic Ocean Region (East).
AOR-W.................................................................................. Atlantic Ocean Region (West).
ARQ............................................................................................. Automatic Request Repeat
The error correction process used in store-and-forward messaging by which a receiver
checks for errors in received data packets and requests the sending end to re-transmit
any packets which were received containing an error.
ASCII............................................ American Standard Code for Information Interchange
A standard alphanumeric character set based on 7-bit codes.
AUSREP:
A vessel position-reporting system similar to AMVER, but operated by the Australian
Authorities.
B
Backup:
A copy of a program or document that you can use if the original is destroyed. To back
up is to make a copy.
BB .....................................................................................................................Bulletin Board
Operational information of LES, which send from satellite to each ship.
BBER............................................................................................ Bulletin Board Error Rate
Used as a measure of the quality of reception by the MES of the Bulletin Board of a
TDM Channel.
BCD .................................................................................................... Binary Coded Decimal
BER................................................................................................................... Bit Error Rate
Bit: The basic unit of digital communications; may be either 1 or 0.
BPS .................................................................................................................... bit per second
A unit of measurement for speed of data transfer or throughput.
BPSK ............................................................................................Binary Phase Shift Keying
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