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Chapter 3. Test Modes
61200062L1-1 DSU 56/64 User Manual 3-7
FAR END TESTS
Remote Digital
When the RDL test is initiated at the local DSU 56/64, 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 L
OOP
O
NLY
test for a local DSU,
shown in Figure 3-4 on page 3-6. This Loopback
test is performed
with data from the terminal or test equipment. The RDL LED
flashes during initialization of the test and turns on solid once the
test is in progress.
To initiate the RDL test, perform the following steps:
1. Press S
ELECT
five times to turn on the RDL test indicator.
2. Press T
EST
while this test indicator is on.
3. To terminate this test, press T
EST
.
RDL with Test Pattern (TP)
When the RDL
WITH
TP test is initiated at the local DSU 56/64, the
local DSU 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 L
OOP
O
NLY
test for a local DSU; see Figure 3-4 on page 3-6. This L
OOPBACK
test
is performed with data from the internal test pattern generator and
error detector. The RDL and PTRN LEDs flash during initialization
of the test and turn on solid once the test is in progress.
To initiate the RDL
WITH
TP test, perform the following steps:
1. Press S
ELECT
six times to turn on both the RDL and PTRN test
indicators.
2. Press T
EST
while these test indicators are on.
3. To terminate this test, press the T
EST
switch.