User guide

74
Glossary
 3G — Third Generation. 3G refers to the third generation of mobile telephony technology. The
evolution of 3G technology is as follows:
CDMA technologies
» 1xRTT offered speeds up to 144 Kbps (2002).
» EV-DO increased downlink speeds up to 2.4 Mbps (2004).
» EV-DO Rev A boosted downlink speeds to 3.1 Mbps (2006).
» EV-DO Rev B can use 2 to 15 channels with each downlink peaking at 4.9 Mbps.
» Ultra Mobile Broadband was slated to reach 288 Mbps but operators might switch to LTE instead.
 802.11 (b, g, n) — A set of WLAN communication standards in the 2.4, 3.6 and 5 GHz frequency bands.
 bps — bits per second. The rate of data flow.
 Broadband — High-capacity high-speed, transmission channel with a wider bandwidth than
conventional modem lines. Broadband channels can carry video, voice, and data simultaneously.
 CDMA — Code Division Multiple Access. It is the underlying channel access method used by some
mobile phone standards.
 DHCP — Dynamic Host Configuration Protocol. Software found in servers and routers that
automatically assigns temporary IP addresses to clients logging into an IP network.
 DHCP Server — A server or service with a server that assigns IP addresses.
 DNS — Domain Name System. A system for converting host names and domain names into IP
addresses on the Internet or on local networks that use the TCP/IP protocol.
 ESN — Electronic Serial Number. A unique 32-bit number embedded in a wireless device that
identifies the device.
 Firewall — A hardware or software boundary that protects a network or single computer from
unwanted outside traffic.
 Firmware — A computer program embedded in an electronic device. Firmware usually contains
operating code for the device.
 GPS — Global Positioning System. A radio-based navigation system that allows users to determine
their location. The device uses satellite data to calculate its position. Commonly used in mapping and
navigation systems.
 Host Name — The unique name by which a network-attached device is known on a network.
 Hotspot — A WiFi (802.11) access point or the area covered by an access point. Used for connecting
to the Internet.
 Hot-Swappable — The ability to safely remove and replace a component (for example, a memory
card or USB device) from a device or computer while it is powered on.