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Appendix C: Important Safety Information and Glossary
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.
3.75G: A more recent standard of mobile networking technology; generally uses HSUPA.
4G: A more recent standard of mobile networking technology; generally uses LTE.
APN (Access Point Name/Network): Provides GPRS routing information. Consists of:
Network ID: Identifies the external service requested by a GPRS user.
Mobile network operator ID: Specifies routing information.
ARFCN (Absolute Radio Frequency Channel Number): The specific ID numbers for all
radio channels used in cellular mobile communications.
bps (bits per second): How data flow is measured.
CHAP (Challenge Handshake Authentication Protocol): CHAP identifiers are changed
frequently and authentication can be requested by the server at any time.
DNS (Domain Name System): Helps route network traffic 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.
HSDPA (High Speed Downlink Packet Access): Advanced WCDMA that delivers downlink
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