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Glossary
GL-11
Kerberos Kerberos is a network authentication protocol. It is
designed to provide strong authentication for client/server
applications by using secret-key cryptography. A free
implementation of this protocol is available from the
Massachusetts Institute of Technology. Kerberos is
available in many commercial products as well.
Key A key is the specific code used by the algorithm to encrypt
or decrypt the data. Also see, Encryption and Decrypting.
LAN Local area network. A radio network that supports data
communication within a local area, such as within a
warehouse of building.
laser scanner A type of bar code reader that uses a beam of laser light.
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 generate a laser beam. This laser type
is a compact source of coherent light.
LCD See Liquid Crystal Display.
LED Indicator A semiconductor diode (LED - Light Emitting Diode) used as
an indicator, often in digital displays. The semiconductor
uses applied voltage to produce light of a certain frequency
determined by the semiconductor's particular chemical
composition.
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
their bias. They use little electricity and react relatively
quickly. They require external light to reflect their
information to the user.
Light Emitting Diode See LED.
MAC Address (also called IEEE Address) Spectrum24
®
devices, like other Ethernet devices, have
unique, hardware-encoded MAC (also called IEEE
addresses). MAC addresses determine the device sending
or receiving data. The MAC address is a 48-bit number
written as six hexadecimal bytes separated by colons.