Internal Timing; Secondary Timing; Figure 4-8. Internal Clock Source; Figure 4-9. Secondary Clock Source - ADTRAN TSU 610 User Manual

Chapter 4. T1 Network Interface

Internal Timing

The TSU 610 is the source of timing. The TSU 610 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 4-8.

Figure 4-8. Internal Clock Source

Secondary Timing

The secondary interface is the source of timing. The TSU 610
uses the clock derived by the secondary interface for
transmission timing. See Figure 4-9.

Figure 4-9. Secondary Clock Source

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