<s>
SPI-3	B-Protocol
or	O
System	B-Protocol
Packet	I-Protocol
Interface	I-Protocol
Level	O
3	O
is	O
the	O
name	O
of	O
a	O
chip-to-chip	O
,	O
channelized	O
,	O
packet	O
interface	O
widely	O
used	O
in	O
high-speed	O
communications	O
devices	O
.	O
</s>
<s>
It	O
was	O
proposed	O
by	O
PMC-Sierra	O
based	O
on	O
their	O
PL-3	B-Protocol
interface	O
to	O
the	O
Optical	O
Internetworking	O
Forum	O
and	O
adopted	O
in	O
June	O
2000	O
.	O
</s>
<s>
PL-3	B-Protocol
was	O
developed	O
by	O
PMC-Sierra	O
in	O
conjunction	O
with	O
the	O
SATURN	O
Development	O
Group	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
be	O
used	O
in	O
systems	O
that	O
support	O
OC-48	O
SONET	B-Protocol
interfaces	O
.	O
</s>
<s>
A	O
typical	O
application	O
of	O
SPI-3	B-Protocol
is	O
to	O
connect	O
a	O
framer	O
device	O
to	O
a	O
network	O
processor	O
.	O
</s>
<s>
Implementations	O
of	O
SPI-3	B-Protocol
(	O
PL-3	B-Protocol
)	O
have	O
been	O
produced	O
which	O
allow	O
somewhat	O
higher	O
clock	O
rates	O
.	O
</s>
<s>
SPI-3	B-Protocol
(	O
and	O
PL-3	B-Protocol
)	O
was	O
a	O
highly	O
successful	O
interface	O
with	O
many	O
semiconductor	O
devices	O
produced	O
to	O
it	O
.	O
</s>
