October 2018
Intermediate to advanced
962 pages
40h 41m
English
Content preview from Industrial Communication Systems
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48-6 Industrial Communication Systems
e PCF uses a virtual carrier-sense mechanism aided by an access priority mechanism. e PCF
distributes
information
using
Beacon
management
frames
to
gain
control
of
the
medium
by
setting
the
NAV
in
the
stations.
In
addition,
all
frame
transmissions
under
the
PCF
may
use
a
Point
Interframe
Space
(PIFS)
that
is
smaller
than
the
DIFS
for
frames
transmitted
via
the
DCF.
is
means
that
point-
coordinated
trac
has
priority
in
accessing
the
medium
over
stations
in
overlapping
networks
operat-
ing
in
the
DCF
mode.
Such
an
access
priority
may
be
utilized
to
realize
a
contention-free
(CF)
access
method.
e
PC
controls ...
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