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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 bandwidth
intensive data at up to 7.2Mbps; typically associated with 3.5G.
HSUPA (High Speed Uplink Packet Access): Advanced WCDMA that delivers uplink bandwidth
intensive data at up to 5.76Mbps; typically associated with 3.75G.
HSPA+ (High Speed Packet Access +): This is also known as HSPA Evolved, is the next step and is
more focused on delivering data services enabling speeds of up to 42Mbps in the downlink
and 11Mbps in the uplink.
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.
Appendix C: Important Safety Information and Glossary
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