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Chapter 7. Test Menu ESU E1 Figure 7-3. Network Loopback Tests DTE Interface Loopbacks The Nx56K/64K serial interface offers a DTE loopback. See Figure 7-4. DTE Loopback Loops all data from the DTE back towards the DTE. This loopback may be initiated by using the front panel or TWatch PRO commands. The DTE (or the external test equipment) must provide a test pattern to check the DTE interface. ESU Figure 7-4. DTE Interface Loopback 61200410L1-1B ESU LT User Manual 59