61200.078L1-1
DSU 5600 User Manual
21
Chapter 3. Test Modes
FAR END TESTS
Remote Digital Loopback (RDL)
When the remote digital loopback (RDL) test is initiated at the
local DSU 5600, it commands the remote DSU into loopback with
the industry standard V.54 loopback pattern. The loopback point
and the signal paths for the remote DSU are the same as the
Loop Only test for a local DSU (Figure 3-4). This loopback test is
performed with data from the terminal or test equipment.
To initiate the RDL test, perform the following steps:
1. Press the
Select
switch five times to turn
On
the RDL test
indicator.
2. Press
Test
while the test indicator is
On
. The RDL LED
Flashes
during initialization of the test and turns
On
solid
once the test is in progress.
To terminate this test, press
Test
.
RDL with Test Pattern (TP)
When the RDL with TP test is initiated at the local DSU 5600, it
commands the remote DSU into loopback with the industry
standard V. 54 loopback pattern. The loopback point and the
signal paths for the remote DSU are the same as the Loop Only
test for a local DSU (Figure 3-4). This loopback test is performed
with data from the internal test pattern generator and error
detector.
To initiate the RDL with TP test, perform the following steps:
1. Press
Select
six times to turn
On
both the RDL and PTRN
test indicators.
2. Press
Test
while these test indicators are
On
. The RDL and
PTRN LEDs
Flash
during initialization of the test and turn
On
solid once the test is in progress.
To terminate this test, press
Test
.
