<s>
In	O
telecommunications	O
,	O
a	O
transverse	B-Error_Name
redundancy	I-Error_Name
check	I-Error_Name
(	O
TRC	O
)	O
or	O
vertical	B-Error_Name
redundancy	I-Error_Name
check	I-Error_Name
is	O
a	O
redundancy	O
check	O
for	O
synchronized	O
parallel	O
bits	O
applied	O
once	O
per	O
bit	O
time	O
,	O
across	O
the	O
bit	O
streams	O
.	O
</s>
<s>
This	O
requires	O
additional	O
parallel	O
channels	O
for	O
the	O
check	B-Error_Name
bit	I-Error_Name
or	O
bits	O
.	O
</s>
<s>
The	O
term	O
usually	O
applies	O
to	O
a	O
single	O
parity	B-Error_Name
bit	I-Error_Name
,	O
although	O
it	O
could	O
also	O
be	O
used	O
to	O
refer	O
to	O
a	O
larger	O
Hamming	B-Error_Name
code	I-Error_Name
.	O
</s>
<s>
The	O
adjective	O
"	O
transverse	O
"	O
is	O
most	O
often	O
used	O
when	O
it	O
is	O
used	O
in	O
combination	O
with	O
additional	O
error	O
control	O
coding	O
,	O
such	O
as	O
a	O
longitudinal	B-Error_Name
redundancy	I-Error_Name
check	I-Error_Name
.	O
</s>
<s>
Although	O
parity	B-Error_Name
alone	O
can	O
only	O
detect	O
and	O
not	O
correct	O
errors	O
,	O
it	O
can	O
be	O
part	O
of	O
a	O
system	O
for	O
correcting	O
errors	O
.	O
</s>
<s>
An	O
example	O
of	O
a	O
TRC	O
is	O
the	O
parity	B-Error_Name
written	O
to	O
the	O
9th	O
track	O
of	O
a	O
9-track	B-Device
tape	I-Device
.	O
</s>
