ADTRAN 1200410L2, User Manual

Page: 45 / 80

Chapter 5. Configuration Menu
61200410L2-1A ESU LT User Manual 45
Internal Timing
The ESU LT is the source of timing. The ESU LT is configured to
use its own internal oscillator as the source of timing. Applications
include private line driver circuits, where one end is set to network
and the other to internal.
See Figure 5-3
.
Figure 5-3. Internal Timing Clock Source
DTE Timing
The DTE is the source of timing. The ESU LT uses the incoming
DTE clock to determine the transmission timing. This is typically
used in applications such as limited distance line drivers, where it is
necessary to have the DTE as the primary clock source. See Figure
5-4.
Figure 5-4. DTE Clock Source