E-2
WorldPhone Liberator – Chapter 5. Appendices
List of terms cont’d
LES
Land Earth Station, a station that interconnects fixed telecommunica-
tions networks with the Inmarsat system; may also be called a CES (Coast
Earth Station) or a GES (Ground Earth Station).
MES
Mobile Earth Station, a user terminal for an Inmarsat system; the
WorldPhone terminal is an MES for the Inmarsat Mini-M system; MES may
also be called SES (Ship Earth Station) or, if on aircraft, AES (Aeronautical
Earth Station).
NCS
Network Coordination Station, station that supervises all messages and
signals sent in the Inmarsat system; one in each Ocean Region.
NIMS
Nera Internet Messages Service, allows a message of maximum 1024
characters to be sent to the WorldPhone from a website, or to an e-mail
address from the WorldPhone.
Non-ARQ
non-automatic repeat request, see ARQ
Ocean Region
the coverage area of an Inmarsat satellite within which the
see map in chapter 1. Introduction
PABX
private automatic branch exchange
PCCA
Portable Computer & Communications Association Modem Stand-
ards Committee.
PIN
Personal Identification Number
POR
Pacific Ocean Region,
see map in chapter 1. Introduction
PUK
Personal Unblocking Key, code that allows unblocking a SIM card.
RF
Radio Frequency
RNR
Receiver Not Ready data signal
RR
Receiver Ready data signal
S/A operator
StandAlone operator who maintains connectivity in the event
of Network Coordinating Station failure.
SIM
Subscriber Identity Module
SMS
Short Message System
Spot Beam
an Ocean Region is divided into sub-regions, each “spotlighted”
by a beam from the region satellite.
Terrestrial Network
a fixed telecommunications network, such as a tele-
phone network or a data network, which connects to the Inmarsat system at
an LES/NCS.
TNID
Terrestrial Network Identification Digits
UTC
Coordinated Universal Time, referenced to Greenwich Mean Time
(GMT)
Appendix E – List of terms cont’d
