<s>
In	O
telecommunications	O
,	O
subnetwork	B-Protocol
connection	I-Protocol
protection	I-Protocol
(	O
SNCP	O
)	O
,	O
is	O
a	O
type	O
of	O
protection	O
mechanism	O
associated	O
with	O
synchronous	B-Protocol
optical	I-Protocol
networks	I-Protocol
such	O
as	O
synchronous	B-Protocol
digital	I-Protocol
hierarchy	I-Protocol
(	O
SDH	O
)	O
.	O
</s>
<s>
SNCP	O
is	O
a	O
dedicated	O
(	O
1+1	O
)	O
protection	O
mechanism	O
for	O
SDH	O
network	B-Architecture
spans	O
which	O
may	O
be	O
deployed	O
in	O
ring	O
,	O
point	O
to	O
point	O
or	O
mesh	O
topologies	B-Architecture
.	O
</s>
<s>
SNCP	O
is	O
a	O
per	O
path	B-Protocol
protection	I-Protocol
.	O
</s>
<s>
SNCP	O
is	O
a	O
network	B-Architecture
protection	O
mechanism	O
for	O
SDH	O
networks	O
providing	O
path	B-Protocol
protection	I-Protocol
(	O
end-to-end	O
protection	O
)	O
.	O
</s>
<s>
The	O
changeover	O
criteria	O
are	O
specified	O
individually	O
when	O
configuring	O
a	O
network	B-Architecture
element	O
.	O
</s>
<s>
Now	O
consider	O
a	O
failure	O
state	O
where	O
fiber	B-Architecture
between	O
node	O
A	O
and	O
node	O
B	O
is	O
cut	O
.	O
</s>
