Glossary
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N
NAT Network Address Translation. An Internet standard that enables a local-area network to
use one set of IP addresses for internal traffic and a second set of addresses for external
traffic. A NAT module makes all necessary address translations.
P
PIN Personal Identification Number. A code number used to provide access to a system that
has restricted access.
PoE Power over Ethernet
POST Power On Self Test. A test sequence that runs every time the system is powered up or
reset.
PPPoE Point-to-Point Protocol over Ethernet. A network protocol for encapsulating Point-to-
Point Protocol (PPP) frames inside Ethernet frames. By using PPPoE, users can virtually
"dial" from one machine to another over an Ethernet network, establish a point to point
connection between them and then securely transport data packets over the connection.
PS Packet-Switched. Packet-switched networks move data in separate, small blocks (packets)
based on the destination address in each packet.
PUK PIN Unblocking Key. An eight-digit code used to unblock a SIM card after three incorrect
PINs have been entered. The PUK code is supplied with the SIM card.
S
SAS Satellite Access Station. The gateway between the satellites and the worldwide networks
such as Internet, telephone network, cellular network etc.
SIM Subscriber Identity Module.The SIM provides secure storing of the key identifying a
mobile phone service subscriber but also subscription information, preferences and
storage of text messages.
SIP Session Initiation Protocol. An application-layer control (signalling) protocol for creating,
modifying, and terminating sessions with one or more participants. Used e.g. for Internet
telephony.
SMS Short Messaging Service
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