Figure 11-8. Initiating A Loop Only Test - ADTRAN DSU III ARdc User Manual

2=TEST
Interpreting Test Results
The Loop Only test is used for the purpose of looping the DDS circuit
back to the telco. No test results are available from the local DSU III
ARdc.
DTE Only
The DTE Only test provides a method for testing both the DTE interface
drivers and receivers of the local DSU III ARdc plus its loop transmitter
and receiver. For this test, the loop transmit data is connected to the loop
receive data at a point close to the physical network interface. This test
can be used to verify proper operation between the local DTE and the
local DSU III ARdc.
When this test is implemented, the far unit receives an OOS/OOF message from
the network and enters an alarm state.
61200270L1-1
1=LOCAL UNIT
2=REMOTE UNIT

Figure 11-8. Initiating a Loop Only Test

DSU III ARdc User Manual
Chapter 11. Testing and Troubleshooting
1=DTE & LOOP(LL)
2=LOOP ONLY (RT)
3=DTE ONLY
4=DTE WITH TP
5=TEST PATTERN
6=SELF TEST
11-13