<s>
An	O
optical	B-Protocol
line	I-Protocol
termination	I-Protocol
(	O
OLT	O
)	O
,	O
also	O
called	O
an	O
optical	B-Protocol
line	I-Protocol
terminal	I-Protocol
,	O
is	O
a	O
device	O
which	O
serves	O
as	O
the	O
service	O
provider	O
endpoint	O
of	O
a	O
passive	B-Architecture
optical	I-Architecture
network	I-Architecture
.	O
</s>
<s>
to	O
perform	O
conversion	O
between	O
the	O
electrical	O
signals	O
used	O
by	O
the	O
service	O
provider	O
's	O
equipment	O
and	O
the	O
fiber	B-Architecture
optic	I-Architecture
signals	O
used	O
by	O
the	O
passive	B-Architecture
optical	I-Architecture
network	I-Architecture
.	O
</s>
<s>
to	O
coordinate	O
the	O
multiplexing	B-Architecture
between	O
the	O
conversion	O
devices	O
on	O
the	O
other	O
end	O
of	O
that	O
network	O
(	O
called	O
either	O
optical	O
network	O
terminals	O
or	O
optical	O
network	O
units	O
)	O
.	O
</s>
<s>
The	O
diagram	O
below	O
depicts	O
an	O
OLT	O
within	O
a	O
fiber-optic	B-Architecture
network	O
.	O
</s>
<s>
A	O
wavelength	O
division	O
multiplexing	B-Architecture
means	O
for	O
performing	O
an	O
electro/optical	O
conversion	O
of	O
the	O
serial	O
data	O
of	O
the	O
downstream	O
frame	O
and	O
performing	O
a	O
wavelength	O
division	O
multiplexing	B-Architecture
thereof	O
.	O
</s>
<s>
An	O
upstream	O
frame	O
processing	O
means	O
for	O
extracting	O
data	O
from	O
the	O
wavelength	O
division	O
multiplexing	B-Architecture
means	O
,	O
searching	O
an	O
overhead	O
field	O
,	O
delineating	O
a	O
slot	O
boundary	O
,	O
and	O
processing	O
a	O
physical	O
layer	O
operations	O
administration	O
and	O
maintenance	O
(	O
PLOAM	O
)	O
cell	O
and	O
a	O
divided	O
slot	O
separately	O
.	O
</s>
<s>
A	O
control	O
signal	O
generation	O
means	O
for	O
performing	O
a	O
media	B-Protocol
access	I-Protocol
control	I-Protocol
(	O
MAC	O
)	O
protocol	O
and	O
generating	O
variables	O
and	O
timing	O
signals	O
used	O
for	O
the	O
downstream	O
frame	O
processing	O
means	O
and	O
the	O
upstream	O
frame	O
processing	O
means	O
.	O
</s>
