Appendix R Glossary
R-4
OSC ................................................................................................................................ Oscillator
P
Packet
*An envelope or block of data sent over a network; each packet contains
addressing information as well as the data being sent.
PBX ..................................................................................................... Private Branch eXchanger
PC .................................................................................................................... Personal Computer
PDP ............................................................................................................... Packet Data Protocol
PIN ............................................................................................... Personal Identification Number
PoE ................................................................................................................ Power over Ethernet
POR ............................................................................................................. Pacific Ocean Region
PPP ........................................................................................................... Point-to-Point-Protocol
PPPoE .............................................................................................................. PPP over Ethernet
Protocol
*A defined set of communications standards which lay down the parameters to
which all users must abide. Protocols in general use are X.25 and X.400.
PS ......................................................................................................................... Packet Switched
PSDN ............................................................................................ Packet Switched Data Network
PSTN ................................................................................... Public Switched Telephone Network
PSU .................................................................................................................. Power Supply Unit
PUK .............................................................................................................. PIN Unblocking Key
R
RAM ...................................................................................................... Random Access Memory
REC ....................................................................................................................... Receiving level
ROM ............................................................................................................... Read Only Memory
RSSI ....................................................................................... Received Signal Strength Indicator
RX ...................................................................................................................... Receive/Receiver
S
SAS ........................................................................................................... Satellite Access Station
SCA .......................................................................................................... Service Centre Address
SDM ..................................................................................................... System Definition Manual
SIM ..................................................................................................... Subscriber Identity Module
SMS ........................................................................................................... Short Message Service
SOLAS .......................................................................................................... Safety of Life at Sea
Space segment ........................... Consists of the communications satellites operated by Inmarsat
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