Dbm

For the executive department in the Philippines, see Department of Budget and Management. dBm is an abbreviation for the power ratio in decibel (dB) of the measured power referenced to one milliwatt (mW). It is used in radio, microwave and fiber optic networks as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form. dBm (or dBmW) and dBW are independent of impedance (as opposed to dBV which is dependent, for example).
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Dbm was the first of a family of simple database engines, originally written by Ken Thompson and released by AT&T in 1979 . The name is a three letter acronym for Database manager. It stores data by use of a single key (a primary key) in fixed-size buckets and uses hashing techniques to enable fast retrieval of the data by key.
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Abbreviation.  dB referenced to one milliwatt. (188 ) Note 1: dBm is used in communication work as a measure of absolute power values. Zero dBm equals one milliwatt. Note 2: In DOD practice, unweighted measurement is normally understood, applicable to a certain bandwidth, which must be stated or implied. Note 3: In European practice, psophometric weighting may be implied, as indicated by context; equivalent to dBm0p, which is preferred.

Noise power in dBm, measured with psophometric weighting where where pWp is power in picowatts psophometrically weighted and dBa is the weighted noise power in dB referenced to 3.16 picowatts.

Airport Name: Debre Marcos Airport
Airport Location: Debre Marcos, Ethiopia
IATA Code: DBM
ICAO Code: HADM
  

DATA BASE MANAGER. DBM