D-2 Glossary of Terms Glossary of Terms
D-6 PN: 10580-00318 Rev. P S412E UG
Deviation : The difference between signal parameters (generally in frequency
modulated signals, the difference between the maximum modulated
frequency and the base carrier frequency).
DHCP : Dynamic Host Configuration Protocol (DHCP)
Directional Coupler : A Directional Coupler is a device to split an incident transmission into
two separate paths, and to absorb reflections from the sampled
(coupled) line.
Discriminator : A Discriminator is a demodulation circuit that is used to recover the
modulation from frequency modulated signals. A Discriminator
responds to frequency variations.
Distributed antenna
system : Distributed antenna system is a type of antenna system that is
distributed or remotely located away from the transmitter. Such an
antenna or series of antennas can be connected via coaxial cable, leaky
feeder, or optical fiber link.
DMR : Digital Mobile Radio (DMR)
DSP : Digital Signal Processing (DSP)
Duplex : Duplex refers to two way communication.
EMF : Electromagnetic Field
Flash Memory : Flash memory is a non-volatile solid state storage device that is
packaged as a chip. It can be electrically erased and reprogrammed. T is
primarily used in memory cards, USB flash drives, MP3 players, and
solid-state drives for general storage and transfer of data between
computers and other digital products. Is a specific type of EEPROM
(electrically erasable programmable read-only memory) that is erased
and programmed in large blocks.
FM : Frequency Modulation (FM) is a form of angle modulation in which the
instantaneous frequency of a sine-wave carrier is caused to depart from
the carrier frequency by an amount proportional to the instantaneous
value of the modulating wave. In FM, signals of different frequencies
represent different data values.
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