Fddi - Cisco 7000 Series Hardware Installation And Maintenance

FDDI

Station
Descriptions
Fiber Distributed
network
ISO
9314
token-passing
An
FDDI
most networks
backup
through
shows
Figure
SASs
connections
does
not
DASs
ring
connects
transmitter for the other
transmits
The
dual rings
fails such
single contiguous
continue
to
includes
that
FDDI
Data
Interface
transmission
using
fiber-optic
the international version
rings
primary
fiber-optic
two
of more
consists or
ring
the primary
is
ring
Class or single attachment
Class
or dual attachment
concentrator
FDDI
configuration
typical
FDDI
2-21
Typical Configuration
attach
Class
to
typically
The
SASs
for multiple
SASs
the ring use
interrupt
have two
Class
physical
the both the primary
station to
For example
the primary
to
ring
FDDI
network
in an
Station
2-22
in
as
Figure
This removes
ring
In Figure 2-22
operation
and
Stations
only
which
100-Mbps
specifies
media defined the
is
by
An
ANSI
of the standard FDDI
and
ring secondary
connections
point-to-point
used for data
communication
SAS
stations attach
to
DAS
stations
DAS
SASs
and
with both
DAS
with
Concentrator
the primary
ring through concentrator
concentrator
that
ensures
one and one
transmit
port
PHYA
ports designated
and Each
secondary rings
PHY
receives
traffic
fault tolerance
If
provide
the ring automatically
wraps doubles back
the from
failed station the ring
the ring
eliminate
to
wraps
Network
Preparing
token-passing dual-ring
X3
ANSI
and by
standard
network two
comprises
ring
between
stations
adjacent
and
the secondary used
ring is
and
attached
one
ring are
typically
attach both
to rings Figure
SASs
and
which
provides
of
failure
or power-down
any
receive the single
attach to
port to
PHY
and which
each of
one
is for
receiver
port ring
PHY
the primary and
from
ring
down
on
dual ring shuts
station
on
to
itself
but allows the other
stations
and
Station forms smaller
for Installation
Preparing
Connections
On
as
2-21
SAS
and
or
form
ring
2-31