Preparing
Network
Connections
In the typical
Token
Ring
network
shown
in Figure
2-21
lobe
cables
connect
each
Token
Ring
station
TRIP
port
to
the
MSAU
or
MAU
and
patch
cables
connect
adjacent
MSAUs
or
MAUs
to
form one
large
ring
Figure
2-21
Token
Ring
Network
Physical
Connections
Token
Ring
and
IEEE
802.5
are token-passing
networks
which
move
small
frame
called
token
around
the
network
Possession
of the token
grants
the
right
to
transmit
station
with
information
to
transmit
must
wait
until
it
detects
free
token
passing
by
When
all stations
on
the ring are idle the token
packet
is
labeled
as
afree
token
If
the
station
receiving
the token
has
no
information
to
send
it
simply
passes
the free token
to
the next
station
station
that
does
have
information
to
transmit
seizes the
token
alters
bit
of the token
frame
which
changes
the free token
to
busy
token
appends
the information
it
wants
to
transmit
and
then
sends
this
information
to
the next
station
on
the ring
The
busy token
with
the information
frame
circulates
the ring
until
it
reaches
the intended
destination
station
which
copies
the information
for
further processing
and
passes
the
busy
token
and
information
frame back
out
to
the ring
The
information
frame
continues
to
circle
the ring
until
it
reaches
the
original
sending
station
which
checks
the returned
frame
to
ensure
that
the destination
station
received
the information
When
the
original sending
station
determines
that
the receiving
station
accepted
the information
it
purges
the
token
and
information
frame and
transmits
new
free
token
out
to
the ring
While
the information
frame
is
circling
the ring
there
is
no
token
on
the
network
unless
early token
release
is
enabled
which
is
described
later
in
this
section
so other
stations
wanting
to
transmit
must
wait Therefore
collisions
cannot
occur
in
Token
Ring
networks
2-32
Cisco
7513
Hardware
Installation
and
Maintenance
Summary of Contents for 7513 Series
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