Dte And Loop (Ll); Test Description; Test Purpose; Figure 11-5. Dte & Loop Test - ADTRAN DSU III AR User Manual

Chapter 11. Testing and Troubleshooting

DTE and Loop (LL)

Test Description

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 11-5 illustrates the loopback points and the signal paths for
this test.
DTE
Tx
Rx

Test Purpose

The DTE & Loop test is used for the following purposes:
•
•
11-12
test splits the DSU III AR into two separate DTE
OOP
LOCAL
DSU/CSU
DTE Tx
DTE Rx
Verify integrity of the DTE interface and cable.
Provide a loopback for network tests.
DSU III AR User Manual
NET Tx
NET Rx
Figure 11-5. DTE & Loop Test
test
OOP
TELCO
61202011L1-1