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Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Narrowband radio voice frequency (NBRVF)

Telecommunications; General telecom

In narrowband radio, the nominal 3-kHz bandwidth allocated for single channel radio that provides a transmission path for analogue and quasi-analog signals.

Sentinel

Telecommunications; General telecom

In data transmission or processing, an indicator, such as a signal, symbol, character, or digit, used for identification. Note: A flag may be a byte, word, mark, group mark, or ...

Restricted channel

Telecommunications; General telecom

In digital communications systems, a channel that has a useful capacity of only 56 kb/s (kilobits per second,) instead of 64 kb/s. Note: The restricted channel, currently common ...

Frame synchronisation pattern

Telecommunications; General telecom

In digital communications, a prescribed recurring pattern of bits transmitted to enable the receiver to achieve frame synchronization.

Certificate user

Telecommunications; General telecom

In cryptography, a station, agency, or individual user that needs to know, with certitude, the public key of another entity.

Chosen-plaintext attack

Telecommunications; General telecom

In cryptography, an analytical attack in which a cryptanalyst can submit an unlimited number of plaintext messages and examine the corresponding ciphertext.

Certificate serial number

Telecommunications; General telecom

In cryptography, an integer value that is (a) unique within the issuing certificate authority (CA,) and (b) unambiguously associated with a certificate issued by that CA.

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