Glossary GL-9
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.
MC Mobile Computer.
MDN Mobile Directory Number. The directory listing telephone
number that is dialed (generally using POTS) to reach a
mobile unit. The MDN is usually associated with a MIN in
a cellular telephone -- in the US and Canada, the MDN and
MIN are the same value for voice cellular users.
International roaming considerations often result in the
MDN being different from the MIN.
MIL 1 mil = 1 thousandth of an inch.
MIN Mobile Identification Number. The unique account number
associated with a cellular device. It is broadcast by the
cellular device when accessing the cellular system.
Misread (Misdecode) A condition which occurs when the data output of a reader
or interface controller does not agree with the data
encoded within a bar code symbol.
Mobile Computer In this text, mobile computer refers to the Symbol Series
9000 wireless portable computer. It can be set up to run
as a stand-alone device, or it can be set up to communicate
with a network, using wireless radio technology.
NCU Network Control Unit.
NetBeui A non-routable LAN protocol that is an extension to
NetBIOS. Used for IBM’s OS/2-based LAN Manager and
Microsoft’s LAN Manager and Windows for Workgroups.
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