Glossary
98
PSTN Public Switched Telephone Network. The network of the
world’s public circuit-switched telephone networks. It consists
of telephone lines, fibre-optic cables, microwave transmission
links, cellular networks, communications satellites, and undersea
telephone cables all inter-connected by switching centres
which allows any telephone in the world to communicate with
any other.
PU Position Unreserved
R
RED Radio Equipment Directive
S
SAC Short Access Code
SAR Search And Rescue
SARF Service Activation Registration Form. A form used to register
your mobile equipment for activation of the services you are
going to use.
SOLAS (International Convention for the) Safety Of Life At Sea.
Generally regarded as the most important of all international
treaties concerning the safety of merchant ships.
SSA Ship Security Alert. The ship security alert system is provided to
a vessel for the purpose of transmitting a security alert to the
shore (not to other vessel!) to indicate to a competent
authority that the security of the ship is under threat or has
been compromised.
T
TCU Terminal Control Unit
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