User's Manual

118 Glossary TB9300 Installation and Operation Manual
© Tait Limited March 2017
DDC Digital Down Converter. A device which converts the digitized IF signal of
the receiver down to a lower frequency (complex baseband) to suit the DSP.
dispatcher A person who gives official instructions by radio to one or more mobile
stations.
DMR Digital Mobile Radio. A set of standards and requirements endorsed by
ETSI and intended for professional mobile radio (PMR) users.
dotted quad A method for writing IPv4 addresses. The form is DDD.DDD.DDD.DDD
where DDD is an 8-bit decimal number.
downlink The transmission path from fixed equipment to mobile stations.
DSP Digital Signal Processor.
duplex Providing transmission and reception in both directions simultaneously.
duty cycle Used in relation to the PA, it is the proportion of time (expressed as a
percentage) during which the PA is transmitting.
EIA Electronic Industries Alliance. Accredited by the American National
Standards Institute (ANSI) and responsible for developing
telecommunications and electronics standards in the USA.
EMC Electromagnetic Compatibility. The ability of equipment to operate in its
electromagnetic environment without creating interference with other
devices.
ETSI European Telecommunications Standards Institute. The non-profit
organization responsible for producing European telecommunications
standards.
fallback mode An operational mode of Tait DMR and MPT trunked networks. It comes
into effect when the base station loses communication with the trunking
node controller. In fallback, one base station operates a control channel and
allocates calls to the other traffic channels at the site. The base station in
fallback mode will accept all registrations without requiring authorisation.
FCC Federal Communications Commission. The FCC is an independent United
States government agency that regulates interstate and international radio
communications.
feature code The alphanumeric code used to identify a feature set.