<s>
The	O
D-Book	B-Device
is	O
the	O
UK	O
technical	O
specification	O
for	O
digital	B-Application
terrestrial	I-Application
television	I-Application
(	O
DTT	O
)	O
.	O
</s>
<s>
The	O
Digital	O
TV	O
Group	O
(	O
DTG	O
)	O
has	O
published	O
and	O
maintained	O
the	O
D-Book	B-Device
for	O
over	O
a	O
decade	O
and	O
the	O
specification	O
is	O
updated	O
annually	O
to	O
keep	O
up	O
with	O
the	O
pace	O
of	O
development	O
in	O
UK	O
DTT	O
.	O
</s>
<s>
The	O
D-Book	B-Device
is	O
compiled	O
by	O
DTG	O
Working	O
Groups	O
composed	O
of	O
industry	O
experts	O
from	O
the	O
DTG	O
’s	O
staff	O
and	O
membership	O
of	O
around	O
150	O
broadcasters	O
,	O
manufacturers	O
,	O
technology	O
providers	O
and	O
other	O
organisations	O
who	O
continually	O
update	O
and	O
peer-review	O
the	O
specification	O
.	O
</s>
<s>
Conformance	O
to	O
D-Book	B-Device
standard	O
allows	O
products	O
to	O
use	O
the	O
Digital	O
Tick	O
,	O
Freeview	B-Device
,	O
Freeview	B-Device
+	O
and	O
Freeview	B-Device
HDlogos	O
.	O
</s>
<s>
The	O
D-Book	B-Device
is	O
only	O
available	O
to	O
members	O
of	O
the	O
Digital	O
TV	O
Group	O
.	O
</s>
<s>
The	O
first	O
edition	O
of	O
the	O
D-Book	B-Device
was	O
written	O
in	O
1996	O
when	O
the	O
current	O
standard	O
for	O
terrestrial	O
broadcasting	O
DVB-T	O
was	O
new	O
and	O
untried	O
.	O
</s>
<s>
From	O
the	O
outset	O
,	O
the	O
D-Book	B-Device
was	O
an	O
implementation	O
guideline	O
and	O
referenced	O
fundamental	O
standards	O
where	O
possible	O
.	O
</s>
<s>
In	O
subsequent	O
editions	O
,	O
it	O
has	O
become	O
possible	O
to	O
reference	O
ETSI	O
or	O
other	O
standards	O
and	O
the	O
previous	O
D-Book	B-Device
section	O
simplified	O
.	O
</s>
<s>
However	O
,	O
the	O
D-Book	B-Device
as	O
an	O
implementation	O
guideline	O
has	O
become	O
more	O
important	O
as	O
non-UK	O
based	O
manufacturers	O
have	O
sought	O
to	O
introduce	O
products	O
to	O
the	O
UK	O
market	O
.	O
</s>
<s>
In	O
March	O
2009	O
,	O
the	O
DTG	O
published	O
the	O
6th	O
edition	O
of	O
the	O
D-Book	B-Device
–	O
enabling	O
the	O
launch	O
of	O
an	O
initial	O
three	O
free-to-air	O
HD	O
channels	O
on	O
Freeview	B-Device
by	O
late	O
2009	O
,	O
as	O
well	O
as	O
the	O
introduction	O
of	O
a	O
broadband	O
return	O
path	O
which	O
has	O
the	O
potential	O
to	O
be	O
used	O
for	O
streaming	O
on-demand	O
video	O
content	O
such	O
as	O
BBC	B-Application
iPlayer	I-Application
,	O
ITV	O
Player	O
and	O
4oD	O
,	O
accessing	O
e-government	O
services	O
and	O
allowing	O
viewers	O
to	O
complete	O
transactions	O
via	O
their	O
television	O
.	O
</s>
<s>
It	O
also	O
introduces	O
DVB-T2	B-Protocol
,	O
the	O
new	O
modulation	O
scheme	O
that	O
is	O
being	O
used	O
in	O
the	O
UK	O
to	O
deliver	O
these	O
services	O
.	O
</s>
<s>
In	O
March	O
2011	O
,	O
the	O
DTG	O
published	O
the	O
7th	O
edition	O
of	O
the	O
D-Book	B-Device
:	O
the	O
book	O
detailed	O
interoperability	O
specifications	O
for	O
UK	O
digital	B-Application
terrestrial	I-Application
television	I-Application
with	O
extended	O
Connected	O
TV	O
functionality	O
.	O
</s>
<s>
D-Book	B-Device
7	O
provides	O
the	O
baseline	O
specification	O
that	O
service	O
providers	O
such	O
as	O
Sky	O
,	O
Virgin	O
Media	O
and	O
YouView	O
can	O
build	O
on	O
for	O
trademark	O
requirements	O
to	O
support	O
their	O
services	O
.	O
</s>
<s>
The	O
industry	O
's	O
test	O
centre	O
:	O
DTG	O
Testing	O
tests	O
digital	O
TV	O
products	O
applying	O
for	O
the	O
Digital	O
Tick	O
,	O
Freeview	B-Device
and	O
Freeview	B-Device
HD	O
logos	O
against	O
the	O
D-Book	B-Device
standard	O
.	O
</s>
<s>
The	O
Freeview	B-Device
HD	O
trademark	O
requirements	O
state	O
that	O
any	O
manufacturer	O
wishing	O
to	O
use	O
the	O
Freeview	B-Device
HD	O
logo	O
on	O
a	O
product	O
must	O
pass	O
the	O
required	O
DTG	O
Testing	O
Freeview	B-Device
HD	O
tests	O
.	O
</s>
