Section 40: Glossary
T
ieline
T E C H N O L O G Y
Page 348
FDD
Frequency Division Duplex operates when a cell-phone
connection uses and up link and a down link that use
different frequencies.
GSM
(Global System for Mobile communications) Today's
second-generation GSM networks deliver high quality
and secure mobile voice and data services (such as
SMS/Text Messaging) with full roaming capabilities
across the world.
(Information courtesy of
GSMworld.com)
3GSM (3G)
3GSM* is the latest addition to the GSM family. 3GSM*
is about having third generation mobile multimedia
services available globally. (Information courtesy of
GSMworld.com)
GPRS
General Packet Radio Service (GPRS) enabled networks
offer 'always-on', higher capacity, Internet-based content
and packet-based data services. (Information courtesy of
GSMworld.com)
GUI
The term General User Interface is described in this
manual as a device for externally connecting to the
COMMANDER
G
3
rack unit to control the 1RU codec.
HSCSD
High Speed Circuit Switched Data utilises circuit
switched channels to achieve data rates up to 43,200bps.
(See also WAP and CSD)
Internet Protocol (IP)
This is an Internet protocol containing addressing
information and some control information which enables
packets of data to be routed. IPv4 is in common use
today and IPv6 is the emerging standard which will
enable greater volumes of IP addresses.
ISDN
The acronym ISDN stands for Integrated Services Digital
Network.
Local Area Network (LAN) This is a high-speed data network with low errors which
covers a fairly small geographic area. These networks
connect workstations, terminals, peripherals and other
devices in a building or similarly limited geographical
area.
Local Exchange
Provides ISDN services - the Network side of the ISDN
loop.
Local Exchange Carrier A local phone company such as regional Bell operating
companies.