<s>
Gunning	B-General_Concept
transceiver	I-General_Concept
logic	I-General_Concept
(	O
GTL	O
)	O
is	O
a	O
type	O
of	O
logic	O
signaling	O
used	O
to	O
drive	O
electronic	O
backplane	B-Architecture
buses	B-General_Concept
.	O
</s>
<s>
It	O
has	O
a	O
voltage	O
swing	O
between	O
0.4	O
volts	O
and	O
1.2	O
volts	O
—	O
much	O
lower	O
than	O
that	O
used	O
in	O
TTL	B-General_Concept
and	O
CMOS	B-Device
logic	O
—	O
and	O
symmetrical	O
parallel	O
resistive	O
termination	O
.	O
</s>
<s>
All	O
Intel	O
front-side	O
buses	B-General_Concept
use	O
GTL	O
.	O
</s>
<s>
The	O
front-side	B-Architecture
bus	I-Architecture
of	O
the	O
Intel	B-Device
Pentium	I-Device
Pro	I-Device
,	O
Pentium	B-General_Concept
II	I-General_Concept
and	O
Pentium	B-General_Concept
III	I-General_Concept
microprocessors	O
uses	O
GTL+	B-General_Concept
(	O
or	O
GTLP	B-General_Concept
)	O
developed	O
by	O
Fairchild	O
Semiconductor	O
,	O
an	O
upgraded	O
version	O
of	O
GTL	O
which	O
has	O
defined	O
slew	O
rates	O
and	O
higher	O
voltage	O
levels	O
.	O
</s>
<s>
AGTL+	B-General_Concept
stands	O
for	O
either	O
assisted	O
Gunning	B-General_Concept
transceiver	I-General_Concept
logic	I-General_Concept
or	O
advanced	B-General_Concept
Gunning	I-General_Concept
transceiver	I-General_Concept
logic	I-General_Concept
.	O
</s>
