Appendix B: Important Safety Information and Glossary
56
Glossary
2G:
Second-generation mobile networking technology. Represents a switchover from
analog to digital; most 2G networks use GSM.
3G:
Third-generation mobile networking technology that enables simultaneous
transfer of voice and non-voice data; most 3G networks use WCDMA.
3.5G:
A more recent standard of mobile networking technology; generally uses
HSDPA.
APN (Access Point Name/Network):
Provides GPRS routing information. Consists
of:
Network ID: Identi
fi
es the external service requested by a GPRS user.
Mobile network operator ID: Speci
fi
es routing information.
ARFCN (Absolute Radio Frequency Channel Number):
The speci
fi
c ID numbers
for all radio channels used in cellular mobile communications.
bps (bits per second):
How data
fl
ow is measured.
DNS (Domain Name System):
Helps route network traf
fi
c by making the addressing
process more user-friendly.
DHCP (Dynamic Host Configuration Protocol):
How devices obtain IP addresses
from a server.
DUN (Dial-Up Network):
Windows component that enables online access via a
modem.
EDGE (Enhanced Data GSM Environment/Enhanced Data for Global Evolution):
Advanced GPRS that delivers multimedia and other data needing greater
bandwidth at up to 237 kbps.
GPRS (General Packet Radio Service):
Delivers data in packets at up to 86 kbps.
GSM (Global System for Mobile Communications):
The most popular cellular
network, mostly operates in 850-900 or 1800-1900 MHz; the primary 2G system.
IMEI (International Mobile Equipment Identity):
A number unique to each
GSM/UMTS device that can be used block network access by a stolen mobile
device.
IP (Internet Protocol):
Routes packets over a network.
HSDPA (High Speed Downlink Packet Access):
Advanced WCDMA that delivers
bandwidth intensive data at up to 7.2Mbps; typically associated with 3.5G.
Kbps (Kilobits per second):
A data
fl
ow measure; 1024 bits/second.
LAN (Local Area Network):
A data network with limited range but good bandwidth.
Mbps (Megabits per second):
A data
fl
ow measure; 1,048,576 bits/second.
PPP (Point-to-Point Protocol):
An internet connection method.