<s>
The	O
IBM	B-General_Concept
PC	I-General_Concept
Network	I-General_Concept
was	O
IBM	O
PC	O
's	O
first	O
LAN	B-General_Concept
system	O
.	O
</s>
<s>
It	O
consisted	O
of	O
network	B-Protocol
cards	I-Protocol
,	O
cables	O
,	O
and	O
a	O
small	O
device	B-Application
driver	I-Application
known	O
as	O
NetBIOS	B-Protocol
(	O
Network	B-Protocol
Basic	I-Protocol
Input/Output	I-Protocol
System	I-Protocol
)	O
.	O
</s>
<s>
NetBIOS	B-Protocol
was	O
developed	O
by	O
Sytek	O
Inc	O
as	O
an	O
API	B-Application
for	O
software	O
communication	O
over	O
this	O
IBM	B-General_Concept
PC	I-General_Concept
Network	I-General_Concept
LAN	B-General_Concept
technology	O
;	O
with	O
Sytek	O
networking	O
protocols	O
being	O
used	O
for	O
communication	O
over	O
the	O
wire	O
.	O
</s>
<s>
IBM	O
's	O
later	O
Token	B-Device
Ring	I-Device
network	I-Device
emulated	O
the	O
NetBIOS	B-Protocol
application	B-Application
programming	I-Application
interface	I-Application
,	O
and	O
it	O
lived	O
on	O
in	O
many	O
later	O
systems	O
.	O
</s>
<s>
The	O
original	O
broadband	B-General_Concept
version	O
in	O
1984	O
communicated	O
over	O
75	O
Ω	O
cable	O
television	O
compatible	O
co-axial	O
cable	O
with	O
each	O
card	O
connecting	O
via	O
a	O
single	O
F	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
Frequency-division	B-Protocol
multiplexing	I-Protocol
allowed	O
the	O
cable	O
to	O
be	O
shared	O
with	O
other	O
voice	O
,	O
video	O
,	O
and	O
data	O
traffic	O
.	O
</s>
<s>
Later	O
,	O
in	O
1987	O
a	O
much	O
cheaper	O
"	O
baseband	B-Algorithm
"	O
version	O
,	O
also	O
running	O
at	O
2	O
Mbit/s	O
connected	O
computers	O
in	O
daisy-chain	B-Application
style	O
using	O
twisted-pair	O
cables	O
with	O
6P2C	O
modular	O
telephone	O
connectors	O
(	O
often	O
mistermed	O
"	O
RJ11	O
"	O
)	O
.	O
</s>
<s>
A	O
hybrid	O
star	B-Architecture
topology	I-Architecture
was	O
possible	O
using	O
a	O
hub	O
.	O
</s>
