STATION TYPES
(3)
Secondary
Station
o The primary sends commands to the
secondary stations
o A primary issues commands and a secondary
issues responses
STATION
TYPES (4)
Combined
Station
o A combined station can both command and
respond
o A combined station is one of a set of
connected peer devices programmed to behave
either
as a primary or as a secondary depending on the nature and the direction of
the
transmission
Configuration
(1)
o Configuration refers to the relationship
of the hardware devices on a link
o Primary , secondary and combined stations
can be configured in three ways:
¾ Unbalanced Configuration
¾ Symmetrical Configuration
¾ Balanced Configuration
Configuration
(2)
Unbalanced
Configuration
o Also called Master/Slave Configuration
o One device is a primary and others are
secondary
o Unbalanced configuration can
be point to
point if only
two devices are
involved
o Most
of the times
it is multipoint with
one primary controlling several
secondaries
Configuration
(3)
Symmetrical
Configuration
o Each physical station on a link consists
of two logical stations, one a primary
and
the other a secondary
o Separate lines link the primary aspect of
one physical station to the secondary
aspect
of another physical station
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