Cisco 7000 Series Hardware Installation And Maintenance page 73

Preparing Network Connections
Figure
SASs
connections
does
ring
connects
transmitter
transmits
FDDI
Fault
Management
The dual rings
fails
single contiguous
continue
to
includes
that
Note
stream
upstream
Figure
Station
Station
Station
Cisco 1010 Hardware
2-22 Installation
FDDI
2-11
Typical Configuration
Class attach to the
typically
SASs
The
for
multiple
SASs
not
the
ring
interrupt
DASs
have two
Class
physical
both
the station the
to
primary
For example
the other
for
to the
primary ring
FDDI
network
in
an
such Station 2-12
as in
Figure
This
removes
ring
In Figure
2-12
operation
and
Stations
only
Each
station in refers
ring
based on flow
the
is
signal
neighbor and
transmits
shows
2-12 the primary
signal flow
PHY
and from
on
Station
the
is
upstream neighbor
and Maintenance
DAS
with and
Concentrator
primary ring through
concentrator ensures
that
one transmit one
use port and
PHY
ports designated
and
Each
secondary rings
PHY
receives
traffic
tolerance
provide fault If
wraps doubles back on
the ring automatically
from
the
failed station
the ring eliminate
wraps to
to its stations as
neighbor
upstream
on
the primary
ring station
downstream
the to
primary signal its
from
transmitted
being
PHY
on
Station
to
and
of Station Station
SAS
which
concentrator provides
down
or of any
failure
power
receive port attach the single
to to
PHY
and which
each of
receiver for
one
is
port
and
from the
primary ring
on dual ring shuts
station
itself
but allows the other
the
ring
and
Station forms smaller ring
downstream
or
neighbors
receives
the
primary signal
For example
neighbor
PHY PHY
Station
to
on
Station
reference
Using as
downstream
the
is
neighbor
SAS
ring and
PHY
down
or
form
to
stations
The
from
its
on
of