<s>
Specctra	B-Algorithm
is	O
a	O
commercial	O
PCB	O
auto-router	O
originally	O
developed	O
by	O
John	O
F	O
.	O
Cooper	O
and	O
David	O
Chyan	O
of	O
Cooper	O
&	O
Chyan	O
Technology	O
,	O
Inc	O
.	O
(	O
CCT	O
)	O
in	O
1989	O
.	O
</s>
<s>
Since	O
its	O
integration	O
into	O
Cadence	O
's	O
Allegro	O
PCB	O
Editor	O
,	O
the	O
name	O
of	O
the	O
router	B-Algorithm
is	O
Allegro	B-Algorithm
PCB	I-Algorithm
Router	I-Algorithm
.	O
</s>
<s>
Specctra	B-Algorithm
routes	O
boards	O
by	O
presenting	O
graphical	O
data	O
using	O
a	O
"	O
shape-based	O
"	O
technology	O
which	O
represents	O
graphical	O
objects	O
not	O
as	O
a	O
set	O
of	O
points-coordinates	O
,	O
but	O
more	O
compact	O
.	O
</s>
<s>
This	O
increases	O
the	O
efficiency	O
of	O
routing	B-Algorithm
printed	O
circuit	O
boards	O
with	O
a	O
high	O
density	O
of	O
components	O
,	O
provides	O
automatic	O
routing	B-Algorithm
of	O
the	O
same	O
chain	O
of	O
tracks	O
of	O
different	O
widths	O
and	O
more	O
.	O
</s>
<s>
Specctra	B-Algorithm
uses	O
adaptive	O
algorithms	O
implemented	O
in	O
multiple	O
trace	O
runs	O
.	O
</s>
<s>
The	O
routing	B-Algorithm
is	O
carried	O
out	O
in	O
three	O
stages	O
:	O
</s>
<s>
On	O
each	O
subsequent	O
pass	O
,	O
the	O
auto-router	O
tries	O
to	O
reduce	O
the	O
number	O
of	O
conflicts	O
by	O
breaking	O
and	O
re-building	O
connections	O
(	O
the	O
ripup-and-retry	B-Algorithm
router	I-Algorithm
method	O
)	O
and	O
pushing	O
the	O
conductors	O
by	O
pushing	O
the	O
neighboring	O
ones	O
(	O
the	O
push-and-shove	B-Algorithm
router	I-Algorithm
method	O
)	O
.	O
</s>
<s>
Electromagnetic	O
compatibility	O
can	O
be	O
tested	O
in	O
Specctra	B-Algorithm
through	O
the	O
"	O
SPECCTRAQuest	O
SI	O
Expert	O
"	O
module	O
.	O
</s>
<s>
The	O
program	O
is	O
compatible	O
with	O
many	O
design	O
systems	O
for	O
printed	O
circuit	O
boards	O
,	O
thanks	O
to	O
the	O
use	O
of	O
industrial-standard	O
DSN	O
design	O
file	O
format	O
for	O
project	O
description	O
and	O
Do-files	O
to	O
specify	O
routing	B-Algorithm
strategies	O
.	O
</s>
<s>
The	O
DSN/SES	O
file	O
formats	O
are	O
also	O
supported	O
by	O
a	O
number	O
of	O
other	O
auto-routers	O
including	O
KONEKT	O
ELECTRA	O
,	O
Eremex	B-Algorithm
TopoR	I-Algorithm
,	O
Alfons	O
Wirtz	O
's	O
FreeRouting	O
and	O
RL-based	O
DeepPCB	O
.	O
</s>
<s>
EAGLE	B-Language
(	O
via	O
BRD_TO_DSN.ULP	O
etc	O
.	O
)	O
</s>
<s>
TARGET	B-Algorithm
3001	I-Algorithm
!	I-Algorithm
</s>
