October 2018
Intermediate to advanced
962 pages
40h 41m
English
Content preview from Industrial Communication Systems
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3-6 Industrial Communication Systems
Polling-based access arbitration has been used with IEEE 802.12 and is still implemented in several
real-time
systems.
e
standard
IEEE
802.11
denes
an
optional
polling
mode
for
real-time
services
though
it
is
only
seldom
implemented
because
queue-based
CSMA/CA
is
practically
sucient.
Another
more
rec
ent
exa
mple
is Ethe
rnet
POW
ERLINK,
an Ethe
rnet-based
rea
l-time
pro
tocol.
3.6 Other Media Access Issues
Although the problem of access arbitration is the most important issue, this short section shall highlight
other
iss
ues
tha
t
mus
t
be con
sidered
wit
h
eac
h
imp
lementation.
3.6.1 Access Fairness
Regarding t
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