<s>
In	O
optical	B-Application
fiber	I-Application
communications	I-Application
,	O
a	O
muxponder	B-Device
is	O
the	O
element	O
that	O
sends	O
and	O
receives	O
the	O
optical	O
signal	O
on	O
a	O
fiber	B-Architecture
in	O
much	O
the	O
same	O
way	O
as	O
a	O
transponder	B-Architecture
except	O
that	O
the	O
muxponder	B-Device
has	O
the	O
additional	O
functionality	O
of	O
multiplexing	B-Architecture
multiple	O
sub-rate	O
client	O
interfaces	O
onto	O
the	O
line	O
interface	O
.	O
</s>
