User manual

Glossary
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Glossary
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
PDP Packet Data Protocol. A network protocol used by external packet
data networks that communicate with a GPRS network.
PoE Power over Ethernet
POST Power On Self Test. A test sequence that runs every time the
system is powered up or reset.
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.
R
RDI Restricted Digital Information
RF Radio Frequency. Electromagnetic wave frequencies between
about 3 kilohertz and about 300 gigahertz including the
frequencies used for communications signals (radio, television,
cell-phone and satellite transmissions) or radar signals.