The discipline involving (a) the conception, modeling, and creation, i.e., programming, of a database, (b) data analysis and administration of the database, and (c) database documentation.

A software system that facilitates (a) the creation and maintenance of a database or databases, and (b) the execution of computer programs using the database or databases.

In packet switching, a self-contained packet, independent of other packets, that contains information sufficient for routing from the originating data terminal equipment (DTE) to the destination DTE without relying on prior exchanges between the equipment and the network.
Note: Unlike virtual call service, when datagrams are sent there are no call establishment or clearing procedures. Thus, the network may not… (Read More →)

An instant in the passage of time, identified with desired precision by a clock and a calendar.
Note: An example of a date is 23 seconds after 3:14 PM on February 9,
192
6. This date might be represented as 1926FEB09151
4. 23.

In a message, a set of characters, usually in a prescribed format, used to express the day of the month, the hour of the day, the minute of the hour, the time zone, and the year.
Note 1: The DTG is usually placed in the header of the message.
Note 2: The DTG may be used as a message identifier… (Read More →)

The format used to express the time of an event.
Note: The time of an event on the UTC time scale is given in the following sequence: hour, day, month, year; e.g., 0917 UT, 30 August
199
7. The hour is designated by the 24-hour system.

Abbreviation for decibel(s). One tenth of the common logarithm of the ratio of relative powers, equal to 0.1 B (bel).
Note 1: The decibel is the conventional relative power ratio, rather than the bel, for expressing relative powers because the decibel is smaller and therefore more convenient than the bel. The ratio in dB is given by where P₁ and… (Read More →)

dB of sound volume in relation to 20 micropascal weighted, simulating human ear sensitivity at 40 phon level.
Note 1: 20 micropascal is the human hearing threshold, i.e., 0 dB(A).
Note 2: Sound volumes louder than dB(A) are represented by a graduated scale: dB(B), dB(C), and dB(D).
Note 3: This scale is widely used in occupational safety and hearing protection… (Read More →)

Abbreviation for decibels adjusted. Weighted absolute noise power, calculated in dB referenced to
3. 16 picowatts (-85 dBm), which is 0 dBa.
Note: The use of F1A-line or HA1-receiver weighting must be indicated in parentheses as required. A one-milliwatt, 1000-Hz tone will read +85 dBa, but the same power as white noise, randomly distributed over a 3-kHz band (nominally 300… (Read More →)

Weighted absolute noise power in dBa, measured by a noise measuring set with F1A-line weighting.
Note: F1A weighting is no longer used for DOD applications.