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TSU LT 220V User Manual Chapter 5 Config Menu

Network Timing

The network is the source of timing. The received data clocking is looped back to the network, where it is

used to determine the transmission timing. This option is also referred to as looped timed as the

transmission clock is derived from the received clock. See Figure 5-3.

Figure 5-3. Network Timed Clock Source

DTE Timing

The DTE is the source of timing. The TSU LT 220V 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

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ADTRAN TSU LT Manuel d'utilisateur Page 37