Cisco 7513 Hardware Installation And Maintenance Manual page 103

Network Connections
Preparing
Optical
normal
uninterrupted
onto the ring before
Figure
the
on
switch
fails the
Figure
The
bypass
and
sends
without
when
allow
just
neighbor
Another
concentrators
primary
7513 Hardware
2-38 Cisco
switches avoid
bypass segmentation
operation an optical bypass
When
with
station
reaches the
it
shows
2-26
an optical bypass
Station
is
left functioning
allows the
essentially signals
switch enables
bypass
optical
Operation on
2-26
Bypass
Optical
Station
Station
switch reroutes the
light
back
out to the ring This
it
back
However
wrapping on itself
back
out the ring
to
sending
it
the signal to pass through
next the
station on
the ring
for tolerance
fault
technique
the designated
Only
does the
backup passive
fail
and
Installation Maintenance
failed
by
eliminating
switch allows the
signal
light
switch fails the bypass
bypass
so the ring does
failed station
switch Station
installed
at
so the
normally
bypass
optical
without
to
pass through it
the
bypassed
configuration
DAS
before
signal by
intercepting it
allows the signal maintain
to
stations that
are operating
do
switches
Optical bypass
them
loss
so
signal
significant
is far
away
dual
is homing
whereby
concentrator active unless
primary
is
concentrator activated
is
from
the ring
stations
During
to itself
pass through
directly
switch reroutes the signal
have wrap back on
not
to itself
normal
In the
configuration
switch
transparent
appears
However if
Station
interruption
shown on
the
in Figure
right
station
Optical
bypassed
Station
reaches the Station
failed
it
and
direction
its existing path
repeat the signal
normally
not repeat or drive the signal
when
downstream
can occur the
devices are attached
critical to
or
link fails
it its
and
the ring
sustains
automatically
back
shown
The
2-26
switch
bypass
configuration
they
two
the
If