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Chapter 3. Test Modes
Loop Only Test
DTE OR
TEST
EQUIPMENT
TRANSMIT
INTERFACE
INTERFACE
TD
RD
RECEIVE
INTERFACE
2 0
The Loop Only test allows the loop interface and a major portion
of the DTE interface of the local DSU 5600 to be tested from a
remote site over the actual digital data circuit.
During the Loop Only test, the network receive data is looped to
the network transmit data inside the DTE interface section of the
DSU 5600. The physical DTE interface is ignored for this test. A
block diagram illustrating the loopback point and the signal
paths for this test is shown in Figure 3-4.
To initiate the Loop Only test, perform the following steps:
1. Press Select four times to turn On the loop test indicator.
2. Press Test while this test indicator is On. The Loop LED
Flashes during initialization of the test and turns On solid
once the test is in progress.
To terminate this test, press Test.
DTE
DTE
DSU 5600 User Manual
TRANSMIT
INTERFACE
LOOP
ONLY
INTERFACE
NETWORK
INTERFACE
LOOP
LOOP TX
LOOP RX
LOOP
RECEIVE
Figure 3-4
Loop Only Test Diagram
61200.078L1-1
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