
Chapter 10 Testing, Troubleshooting, and Diagnostics 435
Business Communications Manager - Management User Guide
• manual capability of releasing all loopbacks
DTE Loopback test
The DTE Loopback test forwards data transmitted by the DTE (TxD) and loops the data back to
the DTE (RxD). The DTE Loopback test establishes a data path from the DTE through the internal
DDI Mux circuit and back to the DTE. Refer to Figure 59.
You must transmit a test pattern and monitor the received data at the DDI Mux data port. You can
use a Bit Error Rate Tester to generate and monitor data traffic.
Figure 60 DTE Loopback Test
To begin a DTE Loopback test:
1 Start a Unified Manager session.
2 Click the Resources key and then the Media Bay Modules key.
3 Click the key of the Bus number assigned to the Data Module.
4 Click the Data Module key and then click the Loopback status heading.
Service Provider/
PSTN
T1 mux service
DTE cable
Router
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