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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
Gunning Transceiver Logic
GTL
(GTL) A
standard for electrical signals in CMOS circuits used to
provide higher data transfer speeds with smaller voltage
swings [compared with what?].
The GTL signal swings between 0.4 volts and 1.2 volts with a
reference voltage of about 0.8 volts. Only a small deviation
of 0.4 volts (or thereabouts) from the reference voltage is
required to switch between on and off states. Therefore, a
GTL signal is said to be a low voltage swing logic signal.
Gunning Transceiver Logic has several advantages. The
resistive termination of a GTL signal provides a clean
signalling environment [what?]. Moreover, the low terminating
voltage of 1.2 volts results in reduced voltage drops across
the resistive elements. GTL has low power dissipation and can
operate at high frequency and causes less {electromagnetic
interference} (EMI).
{GTL/BTL: A Low-Swing Solution for High-Speed Digital Logic
(http://edtn.com/scribe/reference/appnotes/md003ecc.htm)}.
(2000-01-16)