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Glossary 83
PDP
Packet Data Protocol.
Phone book
A memory in the SIM card where phone numbers
can be stored and accessed by name or position.
PSTN
Public Switched Telephone Network, for example
ordinary analogue phone line for speech and/or computer
modem.
RADIUS
Remote Access Dial-In Service. Facility at the ISP
or corporation to manage remote data connections.
RAS
Remote Access Service.
RX
Receive
SC
Service Centre (for SMS).
Service Provider
A company that provides services and subscriptions to
GC79 users.
SIM card
Subscriber Identity Module card – a card that must be
inserted in any GSM-based mobile terminal. It contains
subscriber details, security information and memory for
a personal directory of numbers. The card can be a small
plug-in type or credit card-sized, but both types have the
same functions. The GC79 uses the small plug-in card.
SMS
Short Message Service. Allows messages of up to 160
characters to be sent and received via the network
operator's message centre to a GC79.
TCP/IP
Transmission Control Protocol/Internet Protocol.
TCP/IPv4
TCP/IP Version 4. Most widely implemented form of
TCP/IP today having a 4 byte address format such as
212.161.127.136.
TCP/IPv6
Updated version of TCP/IP, having a much larger
address space and many enhancements.
TE
Terminal Equipment. Generic term for GSM terminals
such as phones and PC cards.
Terminal Adaptor
Generic term for the equipment terminating a digital
comms line such as an ISDN2 line. The GC79 is a
Terminal Adaptor since it interfaces to GSM digital
data services.
TLS
Transport Layer Security. Used by Web browsers,
for example.
TX
Transmit
Type II
Refers to thickness of a PC Card as defined in the
specification from PCMCIA.
URL
Uniform Resource Locator.
USSD
Unstructured Supplementary Services Data. Narrow-
band GSM data service. For example entering
*79*1234# might return the stock price for stock 1234.
V.110
ETSI standard for data over an ISDN circuit.
V.120
ETSI standard for data over an ISDN circuit.
VPN
Virtual Private Network.
WECA
Wireless Ethernet Compatibility Alliance. Also known
as the WiFi Alliance. A trade body for promotion of
802.11 technologies and which tests and certifies
products for WiFi inter-operability.
www.weca.net