<s>
D54	B-Protocol
is	O
an	O
analogue	O
lighting	O
communications	O
protocol	O
used	O
to	O
control	O
stage	O
lighting	O
.	O
</s>
<s>
D54	B-Protocol
is	O
still	O
supported	O
on	O
legacy	O
equipment	O
such	O
as	O
the	O
Strand	O
500	O
series	O
consoles	O
alongside	O
DMX	O
.	O
</s>
<s>
Generally	O
a	O
protocol	O
converter	O
is	O
now	O
used	O
to	O
convert	O
DMX	O
(	O
lighting	O
)	O
down	O
to	O
the	O
native	O
D54	B-Protocol
.	O
</s>
<s>
In	O
about	O
1976	O
,	O
to	O
deal	O
with	O
the	O
bulky	O
cable	O
requirements	O
of	O
analogue	O
control	O
,	O
Strand	O
's	O
R&D	O
group	O
in	O
the	O
UK	O
developed	O
an	O
analogue	O
multiplexing	B-Architecture
control	O
system	O
designated	O
D54	B-Protocol
(	O
D54	B-Protocol
is	O
the	O
internal	O
standards	O
number	O
,	O
which	O
became	O
the	O
accepted	O
name	O
)	O
.	O
</s>
<s>
Instead	O
,	O
multiple	O
D54	B-Protocol
streams	O
were	O
supported	O
by	O
some	O
later	O
consoles	O
.	O
</s>
<s>
D54	B-Protocol
was	O
developed	O
in	O
the	O
United	O
Kingdom	O
at	O
approximately	O
the	O
same	O
time	O
as	O
AMX192	O
(	O
another	O
analogue	O
multiplexing	B-Architecture
protocol	O
)	O
was	O
developed	O
in	O
the	O
United	O
States	O
,	O
and	O
the	O
two	O
protocols	O
remained	O
almost	O
exclusively	O
in	O
those	O
countries	O
.	O
</s>
