GLOSSARY
USER’S MANUAL
113
means an Android manufacturer needs to obtain a license from Google in order to
legally pre-install GMS on an Android device. This license is provided by Google without
any license fees.
Host
A computer that serves other mobile computers in a network, providing services such as
network control, database access, special programs, supervisory programs, or program-
ming languages.
IEC
International Electrotechnical Commission. This international agency regulates laser
safety by specifying various laser operation classes based on power output during oper-
ation.
IEEE 802.11
A set of standards carrying out wireless local area network (WLAN) computer communi-
cation in the 2.4, 3.6 and 5 GHz frequency bands. They are created and maintained by
the
IEEE LAN/MAN Standards Committee.
IP
Internet Protocol. The IP part of the TCP/IP communications protocol. IP implements
the network layer (layer 3) of the protocol, which contains a network address and is
used to route a message to a different network or subnetwork. IP accepts "packets"
from the layer 4 transport protocol (TCP or UDP), adds its own header to it and delivers
a "datagram" to the layer 2 data link protocol. It may also break the packet into frag-
ments to support the maximum transmission unit (MTU) of the network.
IP Address
(Internet Protocol address) The address of a computer attached to an IP network. Every
client and server station must have a unique IP address. A 32-bit address used by a com-
puter on a IP network. Client workstations have either a permanent address or one that
is dynamica
lly assigned to them each session. IP addresses are written as four sets of
numbers separated by periods; for example, 204.171.64.2.
LAN
Local area network. A radio network that supports data communication within a local
area, such as within a warehouse of building.
Laser
Light Amplification by Stimulated Emission of Radiation.The laser is an intense light
source. Light from a laser is all the same frequency, unlike the output of an incandescent
bulb. Laser light is typically coherent and has a high energy density.
Laser Diode
A gallium-arsenide semiconductor type of laser connected to a power source to gener-
ate a laser beam. This laser type is a compact source of coherent light.
Light Emitting Diode (LED)
A low power electronic light source commonly used as an indicator light. It uses less
power than an incandescent light bulb but more than a Liquid Crystal Display (LCD).
Liquid Crystal Display (LCD)
A display that uses liquid crystal sealed between two glass plates. The crystals are
excited by precise electrical charges, causing them to reflect light outside according to
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