Clearing, in
telecommunication
Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of ...
s means:
* A sequence of events used to
disconnect a
telephone call
A telephone call, phone call, voice call, or simply a call, is the effective use of a connection over a telephone network between the calling party and the called party.
Telephone calls are the form of human communication that was first enabl ...
and return to the ready state for the next
call setup. It is sometimes, particularly in the context of
common-channel signaling, called teardown.
*
Removal of data from an
automated information system (AIS), its
storage devices, and other peripheral devices with storage capacity, in such a way that the data may not be reconstructed using normal system capabilities (i.e. through the
keyboard).
''Note:'' An AIS need not be disconnected from any external
network before clearing takes place. Clearing enables a product to be reused within, but not outside of, a secure
facility. It does not produce a declassified product by itself, but may be the first step in the declassification process.
See also
*
Disengagement originator
*
National Information Systems Security Glossary
References
Teletraffic
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