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> Available line
In
telecommunication
s, the term
available line
(or
useful line
) has the following meanings:
In voice,
video
, or
data
communications
, a
circuit
between two points that is ready for service, but is in the idle state .
In
facsimile
transmission
, the portion of the scanning line that can be specifically used for image signals.
Source: from
Federal Standard 1037C
and from
MIL-STD-188
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