<s>
In	O
telecommunication	O
,	O
a	O
ternary	B-Protocol
signal	I-Protocol
is	O
a	O
signal	O
that	O
can	O
assume	O
,	O
at	O
any	O
given	O
instant	O
,	O
one	O
of	O
three	O
states	O
or	O
significant	O
conditions	O
,	O
such	O
as	O
power	O
level	O
,	O
phase	O
position	O
,	O
pulse	B-Algorithm
duration	I-Algorithm
,	O
or	O
frequency	O
.	O
</s>
<s>
Examples	O
of	O
ternary	B-Protocol
signals	I-Protocol
are	O
(	O
a	O
)	O
a	O
pulse	O
that	O
can	O
have	O
a	O
positive	O
,	O
zero	O
,	O
or	O
negative	O
voltage	O
value	O
at	O
any	O
given	O
instant	O
(	O
PAM-3	O
)	O
,	O
(	O
b	O
)	O
a	O
sine	O
wave	O
that	O
can	O
assume	O
phases	O
of	O
0°	O
,	O
120°	O
,	O
or	O
240°	O
relative	O
to	O
a	O
clock	O
pulse	O
(	O
3-PSK	O
)	O
,	O
and	O
(	O
c	O
)	O
a	O
carrier	O
signal	O
that	O
can	O
assume	O
any	O
one	O
of	O
three	O
different	O
frequencies	O
depending	O
on	O
three	O
different	O
modulation	B-Application
signal	O
significant	O
conditions	O
(	O
3-FM	O
)	O
.	O
</s>
<s>
Some	O
examples	O
of	O
PAM-3	O
line	B-Protocol
codes	I-Protocol
that	O
use	O
ternary	B-Protocol
signals	I-Protocol
are	O
:	O
</s>
<s>
3-PSK	O
can	O
be	O
seen	O
as	O
falling	O
between	O
"	O
binary	O
phase-shift	B-General_Concept
keying	I-General_Concept
"	O
(	O
BPSK	O
)	O
,	O
which	O
uses	O
two	O
phases	O
,	O
and	O
"	O
quadrature	O
phase-shift	B-General_Concept
keying	I-General_Concept
"	O
(	O
QPSK	O
)	O
,	O
which	O
uses	O
four	O
phases	O
.	O
</s>
