synchronization. The process of adjusting the corresponding
significant instants
of
two signals to obtain the desired phase
relationship between these instants.
Synchronous Data Link Control (SDLC). A protocol for
management of data transfer over a data link.
synchronous transmission. (1)
Data
transmission in which the
time of occurrence of each signal representing a bit
is
related to a
fixed time frame. (2)
Data
transmission in which the sending and _
receiving devices are operating continuously
at
substantially the
same frequency and are maintained,
by
means of correction, in a
desired phase relationship.
syntax. (
1) The relationship among characters
or
groups of
characters, independent of their meanings
or
the manner
of
their
interpretation and use. (2) The structure of expressions in a
language. (3) The rules governing the structure
of
a language.
(4) The relationships among symbols.
text.
In
ASCII and data communication, a sequence of
characters treated as an entity if preceded
and
terminated by one
STX
and
one
ETX
transmission control character, respectively.
time-out. (1) A parameter related to
an
enforced event designed
to
occur
at
the conclusion of a predetermined elapsed time. A
time-out condition can be cancelled
by
the receipt of an
appropriate time-out cancellation signal. (2) A time interval
allotted for certain operations to occur; for example, response to
polling
or
addressing before system operation
is
interrupted and
must be restarted.
track. (1) The
path
or
one of the set of paths, parallel to the
reference edge
on
a
data
medium, associated with a single reading
or writing component as the data medium moves past the
component. (2) The portion of a moving
data
medium such as a
drum,
or
disk,
that
is
accessible to a given reading head position.
transistor-transistor logic
.(TTL). A popular logic circuit family
that
uses multiple-emitter transistors.
translate.
To
transform data from one language
to
another.
Glossary-33
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