Glossary of Terms C-2 Glossary
Site Master User Guide PN: 10580-00252 Rev. K C-7
dBm : dBm is an absolute measurement of power relative to 1 milliwatt. In
other words, dBm is a decibel value referenced to a milliWatt (dBm).
This is a technique for expressing a power measurement in logarithmic
form using 1 mW as a reference. dBm is a decibel ratio (log 10) of Watts
(W) to one milliwatt (1mW). dBm, therefore, represents absolute power.
Examples are: 0 dBm = 1.0 milliwatt, 10 dBm = 10 milliwatt, 30 dBm =
1000 milliwatt = 1 watt.
DHCP : Dynamic Host Configuration Protocol (DHCP)
DSP : Digital Signal Processing (DSP)
DSRC : Dedicated Short Range Communications (DSRC): DSRC is a system
that is intended for communications between two vehicles, or from one
vehicle to a roadside network. Refer to IEEE 802.11p.
DTF : Distance-To-Fault (DTF) is the distance from the instrument output
connector (or the end of a test lead) to a problem area, as indicated by a
peak in the displayed signal. DTF measures the location and reflection
size of impedance mismatches. This is typically a diagnostic
measurement, not a pass/fail judgement measurement. DTF is used to
identify and locate faults within an antenna system when the system is
failing to meet the specified return loss or VSWR limits. DTF is also
useful to verify the total length of a coaxial cable assembly.
DVB-C : Digital Video Broadcasting - Cable (DVB-C), is the DVB European
consortium standard for the broadcast transmission of digital television
over cable. This system transmits an MPEG-2 family digital audio/video
stream, using a QAM modulation with channel coding.
DVB-H : Digital Video Broadcasting - Handheld (DVB-H) is a technical
specification for bringing broadcast services to handheld receivers and
was formally adopted as ETSI standard EN 302 304 in November, 2004.
The major competitor of this technology is DMB (Digital Multimedia
Broadcasting).
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