<s>
In	O
telecommunication	O
,	O
the	O
term	O
multiplex	B-Protocol
baseband	I-Protocol
has	O
the	O
following	O
meanings	O
:	O
</s>
<s>
In	O
frequency-division	B-Protocol
multiplexing	I-Protocol
,	O
the	O
frequency	O
band	O
occupied	O
by	O
the	O
aggregate	O
of	O
the	O
signals	O
in	O
the	O
line	O
interconnecting	O
the	O
multiplexing	O
and	O
radio	O
or	O
line	O
equipment	O
.	O
</s>
<s>
In	O
frequency	O
division	O
multiplexed	O
carrier	O
systems	O
,	O
at	O
the	O
input	O
to	O
any	O
stage	O
of	O
frequency	B-Algorithm
translation	I-Algorithm
,	O
the	O
frequency	O
band	O
occupied	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
output	O
of	O
a	O
group	O
multiplexer	B-Protocol
consists	O
of	O
a	O
band	O
of	O
frequencies	O
from	O
60kHz	O
to	O
108kHz	O
.	O
</s>
<s>
This	O
is	O
the	O
group-level	O
baseband	B-Algorithm
that	O
results	O
from	O
combining	O
12	O
voice-frequency	O
input	O
channels	O
,	O
having	O
a	O
bandwidth	B-Algorithm
of	O
4kHz	O
each	O
,	O
including	O
guard	O
bands	O
.	O
</s>
<s>
In	O
turn	O
,	O
5	O
groups	O
are	O
multiplexed	O
into	O
a	O
super	O
group	O
having	O
a	O
baseband	B-Algorithm
of	O
312kHz	O
to	O
552kHz	O
.	O
</s>
<s>
This	O
baseband	B-Algorithm
,	O
however	O
,	O
does	O
not	O
represent	O
a	O
group-level	O
baseband	B-Algorithm
.	O
</s>
<s>
Ten	O
super	O
groups	O
are	O
in	O
turn	O
multiplexed	O
into	O
one	O
master	O
group	O
,	O
the	O
output	O
of	O
which	O
is	O
a	O
baseband	B-Algorithm
that	O
may	O
be	O
used	O
to	O
modulate	O
a	O
microwave-frequency	O
carrier	O
.	O
</s>
