Dte & Loop (Ll); Test Purpose; Interpreting Test Results; Figure 13-5. Dte & Loop Test - ADTRAN DSU IV ESP User Manual

Chapter 13. Testing and Troubleshooting
DTE & Loop (LL)
The DTE & L
and loop interface sections and then loops the receive data of each
interface back to its respective transmit data. The DTE & L
provides a bidirectional loopback at the DSU/CSU. Figure 13-5
illustrates the loopback points and the signal paths for this test.
DTE
Tx
Rx

Test Purpose

The DTE & L
•
•

Interpreting Test Results

A BERT tester must be used to interpret the test results of a DTE &
L
OOP
13-10
test splits the DSU IV ESP into two separate DTE
OOP
LOCAL
DSU/CSU
DTE Tx
DTE Rx
test is used for the following purposes:
OOP
Verify integrity of the DTE interface and cable.
Provide a loopback for network tests.
test.
DSU IV ESP User Manual
NET Tx
NET Rx
Figure 13-5. DTE & Loop Test
test
OOP
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