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Chapter 6: Certify Fiber Cabling
Autotest in Loopback Mode
131
Step 3: Do an Autotest in Loopback Mode

Caution
If you disconnected the test reference cord from
the output of the tester, you must set the
reference again to make sure your measurements
are reliable.
3-1
On the
SET REFERENCE
screen, when the set reference or
TRC verification procedure is completed, tap
NEXT
to see
how to connect to the fiber under test.
3-2
Clean and inspect the connectors on the fiber under test.
3-3
Make the connections to do the test on the fiber, as shown on
the screen and in Figure 50, then tap
HOME
.
3-4
Tap
TEST
on the main tester or press

on the main or
remote tester.
If the
CHECK FIBER CONNECTIONS
screen shows an open
fiber:
 Make sure that all connections are good and no fibers
have damage. Use the VFL to make sure the fiber under
test has continuity.
 If you are connected to fibers at a patch panel that are
connected together at the far end, and you are not sure
you are connected to the correct fibers, connect the
main tester’s INPUT fiber to different connections until
the test continues.
3-5
If
Bi-Directional
is
On
: Halfway through the test, the tester
tells you to switch the input and output fibers. See “Bi-
Directional Tests” on page 143.
3-6
If
Auto Save
is on, the tester uses the next ID to save the
results.
If
Auto Save
is off, the
SAVE RESULT
screen shows the next
ID available. You can change the ID if necessary.