Glossary - 5
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.
Light Emitting Diode. See LED.
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.
M
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.
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.
N
Nominal. The exact (or ideal) intended value for a specified parameter. Tolerances are specified as positive and
negative deviations from this value.
NVM. Non-Volatile Memory.
Netmask. A netmask is a 32-bit mask used to divide an IP address into subnets and specify the networks available
hosts. In a netmask, two bits are always automatically assigned. For example, in 255.255.225.0, “0” is the assigned
network address; and in 255.255.255.255, “255” is the assigned broadcast address. The 0 and 255 are always
assigned and cannot be used.
O
Open System Authentication. Open System authentication is a null authentication algorithm.
P
PAN . Personal Area Network. Using Bluetooth wireless technology, PANs enable devices to communicate wirelessly.
Generally, a wireless PAN consists of a dynamic group of less than 255 devices that communicate within about a
33-foot range. Only devices within this limited area typically participate in the network.
PING. (Packet Internet Groper) An Internet utility used to determine whether a particular IP address is online. It is used
to test and debug a network by sending out a packet and waiting for a response.
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