Clearing, in
telecommunication
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...
s means:
* A sequence of events used to
disconnect a
call
Call or Calls may refer to:
Arts, entertainment, and media Games
* Call, a type of betting in poker
* Call, in the game of contract bridge, a bid, pass, double, or redouble in the bidding stage
Music and dance
* Call (band), from Lahore, Paki ...
and return to the ready state for the next
call setup
In telecommunication, call setup is the process of establishing a virtual circuit across a telecommunications network. Call setup is typically accomplished using a signaling protocol.
The term call set-up time has the following meanings:
# The ...
. It is sometimes, particularly in the context of
common-channel signaling
In telecommunication, common-channel signaling (CCS), or common-channel interoffice signaling (CCIS), is the transmission of control information ''( signaling)'' via a separate channel than that used for the messages, The signaling channel usually ...
, called teardown.
*
Removal of data from an
automated information system An automated information system (AIS) is an assembly of computer hardware, software, firmware, or any combination of these, configured to accomplish specific information-handling operations, such as communication, computation, dissemination, proc ...
(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
Keyboard may refer to:
Text input
* Keyboard, part of a typewriter
* Computer keyboard
** Keyboard layout, the software control of computer keyboards and their mapping
** Keyboard technology, computer keyboard hardware and firmware
Music
* Musi ...
).
''Note:'' An AIS need not be disconnected from any external
network
Network, networking and networked may refer to:
Science and technology
* Network theory, the study of graphs as a representation of relations between discrete objects
* Network science, an academic field that studies complex networks
Mathematics ...
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 In telecommunication, a disengagement originator is the user or execution unit that initiates a disengagement attempt. The disengagement originator may be the originating user, the destination user, or the communications system. The communications ...
*
National Information Systems Security Glossary Committee on National Security Systems Instruction No. 4009, National Information Assurance Glossary, published by the United States federal government, is an unclassified glossary of Information security terms intended to provide a common vocabula ...
References
Teletraffic
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