<s>
StarLAN	B-Protocol
was	O
the	O
first	O
IEEE	O
802.3	O
standard	O
for	O
Ethernet	B-Protocol
over	I-Protocol
twisted	I-Protocol
pair	I-Protocol
wiring	O
.	O
</s>
<s>
It	O
was	O
standardized	O
by	O
the	O
standards	O
association	O
of	O
the	O
Institute	O
of	O
Electrical	O
and	O
Electronics	O
Engineers	O
(	O
IEEE	O
)	O
as	O
802.3e	B-Protocol
in	O
1986	O
,	O
as	O
the	O
1BASE5	B-Protocol
version	O
of	O
Ethernet	O
.	O
</s>
<s>
The	O
StarLAN	B-Protocol
Task	O
Force	O
was	O
chaired	O
by	O
Bob	O
Galin	O
.	O
</s>
<s>
An	O
early	O
version	O
of	O
StarLAN	B-Protocol
was	O
developed	O
by	O
Tim	O
Rock	O
and	O
Bill	O
Aranguren	O
at	O
AT&T	O
Information	O
Systems	O
as	O
an	O
experimental	O
system	O
in	O
1983	O
.	O
</s>
<s>
The	O
name	O
StarLAN	B-Protocol
was	O
coined	O
by	O
the	O
IEEE	O
task	O
force	O
based	O
on	O
the	O
fact	O
that	O
it	O
used	O
a	O
star	B-Architecture
topology	I-Architecture
from	O
a	O
central	O
hub	B-Protocol
in	O
contrast	O
to	O
the	O
bus	B-Architecture
network	I-Architecture
of	O
the	O
shared	O
cable	O
10BASE5	O
and	O
10BASE2	O
networks	O
that	O
had	O
been	O
based	O
on	O
ALOHANET	O
.	O
</s>
<s>
The	O
standard	O
known	O
as	O
1BASE5	B-Protocol
was	O
adopted	O
as	O
802.3e	B-Protocol
in	O
1986	O
by	O
members	O
of	O
the	O
IEEE	O
802.3	O
standards	O
committee	O
as	O
the	O
Twisted	O
Pair	O
Medium	O
Access	O
Control	O
sublayer	O
and	O
Physical	O
Signalling	O
sublayer	O
specification	O
in	O
section	O
12	O
.	O
</s>
<s>
The	O
original	O
StarLAN	B-Protocol
ran	O
at	O
a	O
speed	O
of	O
1Mbit/s	O
.	O
</s>
<s>
A	O
major	O
design	O
goal	O
in	O
StarLAN	B-Protocol
was	O
reduction	O
in	O
Ethernet	O
installation	O
costs	O
by	O
the	O
reuse	O
of	O
existing	O
telephone	O
on-premises	B-Protocol
wiring	I-Protocol
and	O
compatibility	O
with	O
analog	O
and	O
digital	O
telephone	O
signals	O
in	O
the	O
same	O
cable	O
bundle	O
.	O
</s>
<s>
The	O
signal	O
modulation	O
and	O
wire	O
pairing	O
used	O
by	O
StarLAN	B-Protocol
were	O
carefully	O
chosen	O
so	O
that	O
they	O
would	O
not	O
affect	O
or	O
be	O
affected	O
by	O
either	O
the	O
analog	O
signal	O
of	O
a	O
normal	O
call	O
,	O
on	O
hook	O
and	O
off	O
hook	O
transients	O
,	O
or	O
the	O
20Hz	O
high-voltage	O
analog	O
ring	O
signal	O
.	O
</s>
<s>
Reuse	O
of	O
existing	O
wires	O
was	O
critical	O
in	O
many	O
buildings	O
where	O
rewiring	O
was	O
cost	O
prohibitive	O
,	O
where	O
running	O
new	O
wire	O
would	O
disturb	O
asbestos	O
within	O
the	O
building	O
infrastructure	O
,	O
and	O
where	O
the	O
bus	B-Architecture
topology	I-Architecture
of	O
coaxial	O
bus	O
Ethernet	O
was	O
not	O
installable	O
.	O
</s>
<s>
The	O
wire	O
positioning	O
called	O
T568B	O
in	O
the	O
standard	O
TIA/EIA	O
-568	O
(	O
later	O
called	O
ANSI/TIA	O
-568	O
)	O
was	O
originally	O
devised	O
for	O
StarLAN	B-Protocol
,	O
and	O
pair	O
1	O
(	O
blue	O
)	O
was	O
left	O
unused	O
to	O
accommodate	O
an	O
analog	O
phone	O
pair	O
.	O
</s>
<s>
Pairs	O
2	O
and	O
3	O
(	O
orange	O
and	O
green	O
respectively	O
)	O
carry	O
the	O
StarLAN	B-Protocol
signals	O
.	O
</s>
<s>
This	O
greatly	O
simplified	O
the	O
installation	O
of	O
combined	O
voice	O
and	O
data	O
wiring	O
in	O
countries	O
that	O
used	O
registered	B-Protocol
jack	I-Protocol
connectors	O
and	O
American	O
wiring	O
practices	O
for	O
their	O
phone	O
service	O
(	O
connecting	O
both	O
to	O
the	O
same	O
cable	O
was	O
a	O
simple	O
matter	O
of	O
using	O
a	O
pin	O
–	O
pin	O
RJ45	O
splitter	O
or	O
punching	O
down	O
the	O
same	O
wires	O
to	O
two	O
ports	O
)	O
.	O
</s>
<s>
This	O
arrangement	O
prevented	O
harm	O
to	O
private	B-Device
branch	I-Device
exchange	I-Device
(	O
PBX	O
)	O
equipment	O
in	O
the	O
event	O
that	O
a	O
StarLAN	B-Protocol
cable	O
was	O
plugged	O
into	O
the	O
wrong	O
device	O
.	O
</s>
<s>
Since	O
1BASE5	B-Protocol
reused	O
existing	O
wiring	O
,	O
maximum	O
link	O
distance	O
was	O
only	O
approximated	O
at	O
250m	O
;	O
depending	O
on	O
cable	O
performance	O
up	O
to	O
500m	O
was	O
possible	O
.	O
</s>
<s>
Up	O
to	O
five	O
chained	O
hubs	B-Protocol
were	O
allowed	O
.	O
</s>
<s>
Parts	O
of	O
the	O
StarLAN	B-Protocol
technology	O
were	O
patented	O
by	O
AT&T	O
and	O
were	O
initially	O
part	O
of	O
a	O
wider	O
vision	O
from	O
AT&T	O
to	O
link	O
their	O
UNIX-based	O
AT&T	B-Device
3B2	I-Device
minicomputers	O
to	O
a	O
network	O
of	O
MS-DOS	O
PCs	O
.	O
</s>
<s>
A	O
StarLAN	B-Protocol
card	O
was	O
also	O
offered	O
for	O
the	O
AT&T	B-Device
UNIX	I-Device
PC	I-Device
.	O
</s>
<s>
In	O
1988	O
,	O
AT&T	O
released	O
StarLAN	B-Protocol
10	O
operating	O
at	O
10	O
Mbit/s	O
.	O
</s>
<s>
The	O
original	O
StarLAN	B-Protocol
was	O
renamed	O
StarLAN	B-Protocol
1	O
,	O
reflecting	O
its	O
1	O
Mbit/s	O
speed	O
.	O
</s>
<s>
StarLAN	B-Protocol
10	O
and	O
SynOptics	O
LattisNet	B-Protocol
provided	O
the	O
basis	O
for	O
the	O
later	O
10	O
megabit	O
per	O
second	O
standard	O
10BASE-T	B-Protocol
.	O
</s>
<s>
The	O
10BASE-T	B-Protocol
task	O
force	O
was	O
chaired	O
by	O
Pat	O
Thaler	O
,	O
a	O
member	O
of	O
the	O
StarLAN	B-Protocol
task	O
force	O
.	O
</s>
<s>
10BASE-T	B-Protocol
used	O
the	O
basic	O
signalling	O
of	O
StarLAN	B-Protocol
10	O
and	O
added	O
link	O
beat	O
.	O
</s>
<s>
Some	O
network	O
interface	O
cards	O
such	O
as	O
the	O
3Com	O
3C-523	O
could	O
be	O
used	O
with	O
either	O
StarLAN	B-Protocol
10	O
or	O
10BASE-T	B-Protocol
,	O
by	O
switching	O
link	O
beat	O
on	O
or	O
off	O
.	O
</s>
