<s>
The	O
Common	B-Protocol
Electrical	I-Protocol
I/O	I-Protocol
(	O
CEI	O
)	O
refers	O
to	O
a	O
series	O
of	O
influential	O
Interoperability	O
Agreements	O
(	O
IAs	O
)	O
that	O
have	O
been	O
published	O
by	O
the	O
Optical	O
Internetworking	O
Forum	O
(	O
OIF	O
)	O
.	O
</s>
<s>
The	O
Common	B-Protocol
Electrical	I-Protocol
I/O	I-Protocol
(	O
CEI	O
)	O
Interoperability	O
Agreement	O
published	O
by	O
the	O
OIF	O
defines	O
the	O
electrical	O
and	O
jitter	O
requirements	O
for	O
3.125	O
,	O
6	O
,	O
11	O
,	O
25-28	O
,	O
and	O
56	O
Gbit/s	O
SerDes	O
interfaces	O
.	O
</s>
<s>
The	O
development	O
of	O
electrical	O
interfaces	O
at	O
the	O
OIF	O
began	O
with	O
SPI-3	B-Protocol
in	O
2000	O
,	O
and	O
the	O
first	O
differential	O
interface	O
was	O
published	O
in	O
2003	O
.	O
</s>
<s>
SerDes	O
interfaces	O
have	O
been	O
developed	O
based	O
on	O
CEI	O
for	O
most	O
ASIC	O
and	O
FPGA	B-Architecture
products	O
.	O
</s>
<s>
Beginning	O
with	O
the	O
donation	O
of	O
the	O
PL-3	B-Protocol
interface	O
by	O
PMC-Sierra	O
in	O
2000	O
,	O
the	O
OIF	O
produced	O
the	O
System	B-Protocol
Packet	I-Protocol
Interface	I-Protocol
(	O
SPI	O
)	O
family	O
of	O
packet	O
interfaces	O
.	O
</s>
<s>
SPI-3	B-Protocol
and	O
SPI-4.2	B-Protocol
defined	O
two	O
generations	O
of	O
devices	O
before	O
they	O
were	O
supplanted	O
by	O
the	O
closely	O
related	O
Interlaken	B-Protocol
standard	O
in	O
the	O
SPI-5	B-Protocol
generation	O
in	O
2006	O
.	O
</s>
<s>
The	O
OIF	O
also	O
defined	O
the	O
SerDes	B-Protocol
Framer	I-Protocol
Interface	I-Protocol
(	O
SFI	O
)	O
family	O
of	O
specifications	O
in	O
parallel	O
with	O
SPI	O
.	O
</s>
<s>
As	O
a	O
part	O
of	O
the	O
SPI-5	B-Protocol
and	O
SFI-5	B-Protocol
development	O
,	O
a	O
common	B-Protocol
electrical	I-Protocol
interface	I-Protocol
was	O
developed	O
termed	O
SxI-5	O
.	O
</s>
<s>
PL-3	B-Protocol
was	O
a	O
packet	O
extension	O
of	O
the	O
cells	O
carried	O
by	O
those	O
earlier	O
interfaces	O
.	O
</s>
