<s>
For	O
digital	B-General_Concept
transmission	O
,	O
the	O
Up0-Interface	B-Protocol
is	O
an	O
integrated	B-Protocol
services	I-Protocol
digital	I-Protocol
network	I-Protocol
(	O
ISDN	B-Protocol
)	O
interface	O
used	O
in	O
private	O
networks	O
.	O
</s>
<s>
It	O
is	O
derived	O
from	O
the	O
UK0-Interface	B-Protocol
used	O
in	O
public	O
networks	O
.	O
</s>
<s>
In	O
public	O
networks	O
,	O
the	O
maximum	O
cable	O
length	O
of	O
an	O
U	O
bus	O
is	O
between	O
4	O
and	O
8km	O
,	O
and	O
the	O
maximum	O
length	O
of	O
an	O
S0-bus	B-Protocol
is	O
900	O
meters	O
for	O
Point-to-Point	O
configuration	O
and	O
about	O
150-300m	O
for	O
point-to-multipoint	O
configurations	O
.	O
</s>
<s>
The	O
Up0-bus	O
has	O
,	O
depending	O
on	O
cable	O
quality	O
,	O
a	O
reach	O
of	O
between	O
2	O
and	O
4km	O
,	O
far	O
more	O
than	O
the	O
S0-bus	B-Protocol
.	O
</s>
<s>
This	O
allows	O
the	O
use	O
of	O
ISDN	B-Protocol
telephone	O
equipment	O
in	O
large	O
private	O
networks	O
.	O
</s>
<s>
Unlike	O
the	O
S0-bus	B-Protocol
,	O
the	O
Up0-bus	O
runs	O
at	O
half	O
duplex	O
;	O
that	O
is	O
,	O
both	O
sides	O
alternate	O
in	O
sending	O
and	O
receiving	O
.	O
</s>
<s>
While	O
the	O
S0-bus	B-Protocol
allows	O
for	O
several	O
ISDN	B-Protocol
device	O
connections	O
(	O
up	O
to	O
8	O
)	O
,	O
the	O
Up0-bus	O
can	O
connect	O
only	O
two	O
devices	O
,	O
one	O
at	O
each	O
end	O
of	O
the	O
cable	O
.	O
</s>
