<s>
A	O
punch	B-Protocol
down	I-Protocol
tool	I-Protocol
,	O
punchdown	B-Protocol
tool	I-Protocol
,	O
IDC	B-Protocol
tool	O
,	O
or	O
a	O
Krone	B-Protocol
tool	I-Protocol
(	O
named	O
after	O
the	O
Krone	B-Protocol
LSA-PLUS	I-Protocol
connector	O
)	O
,	O
is	O
a	O
small	O
hand	O
tool	O
used	O
by	O
telecommunication	O
and	O
network	B-Architecture
technicians	O
.	O
</s>
<s>
It	O
is	O
used	O
for	O
inserting	O
wire	O
into	O
insulation-displacement	B-Protocol
connectors	I-Protocol
on	O
punch	B-Protocol
down	I-Protocol
blocks	I-Protocol
,	O
patch	B-Protocol
panels	I-Protocol
,	O
keystone	B-Protocol
modules	I-Protocol
,	O
and	O
surface	O
mount	O
boxes	O
(	O
also	O
known	O
as	O
biscuit	O
jacks	O
)	O
.	O
</s>
<s>
Most	O
punch	B-Protocol
down	I-Protocol
tools	I-Protocol
are	O
of	O
the	O
impact	O
type	O
,	O
consisting	O
of	O
a	O
handle	O
,	O
an	O
internal	O
spring	O
mechanism	O
,	O
and	O
a	O
removable	O
slotted	O
blade	O
.	O
</s>
<s>
To	O
use	O
the	O
punch	B-Protocol
down	I-Protocol
tool	I-Protocol
,	O
a	O
wire	O
is	O
pre-positioned	O
into	O
a	O
slotted	O
post	O
on	O
a	O
punch	B-Protocol
block	I-Protocol
,	O
and	O
then	O
the	O
punch	B-Protocol
down	I-Protocol
tool	I-Protocol
is	O
pressed	O
down	O
on	O
top	O
of	O
the	O
wire	O
,	O
over	O
the	O
post	O
.	O
</s>
<s>
However	O
,	O
the	O
punch	B-Protocol
down	I-Protocol
tool	I-Protocol
blade	O
also	O
is	O
usually	O
used	O
to	O
cut	O
off	O
excess	O
wire	O
,	O
in	O
the	O
same	O
operation	O
as	O
making	O
the	O
connection	O
;	O
this	O
is	O
done	O
with	O
a	O
sharp	O
edge	O
of	O
the	O
punch	B-Protocol
down	I-Protocol
tool	I-Protocol
blade	O
trapping	O
the	O
wire	O
to	O
be	O
cut	O
against	O
the	O
plastic	O
punch	B-Protocol
block	I-Protocol
.	O
</s>
<s>
Tool	O
blades	O
without	O
the	O
sharp	O
edge	O
are	O
also	O
available	O
;	O
these	O
are	O
used	O
for	O
continuing	O
a	O
wire	O
through	O
a	O
slotted	O
post	O
to	O
make	O
connections	O
with	O
another	O
slotted	O
post	O
(	O
"	O
daisy-chained	B-Application
"	O
wiring	O
)	O
.	O
</s>
<s>
For	O
light-duty	O
use	O
,	O
there	O
are	O
also	O
less-expensive	O
punch	B-Protocol
down	I-Protocol
tools	I-Protocol
with	O
fixed	O
blades	O
and	O
no	O
impact	O
mechanism	O
.	O
</s>
<s>
To	O
accommodate	O
different	O
connector	O
types	O
,	O
66	B-Architecture
,	O
110	B-Device
,	O
BIX	B-Protocol
and	O
krone	O
blocks	O
require	O
different	O
blades	O
.	O
</s>
<s>
Removable	O
blades	O
for	O
66	B-Architecture
or	O
110	B-Device
are	O
almost	O
always	O
double-ended	O
.	O
</s>
<s>
Other	O
blades	O
have	O
a	O
cutting	O
66	B-Architecture
blade	O
on	O
one	O
end	O
and	O
a	O
cutting	O
110	B-Device
blade	O
on	O
the	O
other	O
.	O
</s>
