User's Manual

Chapter 4 Basic Testing
Step 4: Starting the test
52 T-BERD/MTS 5800 Getting Started Manual
Step 4: Starting the test
After you configure a test, connect the unit to the circuit, and,
if appropriate, turn the laser ON, the following occurs:
– If you are running a PDH, or classic SONET or SDH appli-
cation, you must turn the laser ON (if you are testing an
optical circuit). The test starts automatically, and test
results immediately accumulate.
– If you are running an optical terminate application, you
must turn the laser ON, and then select Start Traffic (if
monitoring, you do not need to start traffic).
Using the
Action buttons
After you start a test, use the buttons at the bottom of the
screen to perform actions such as turning the laser on and off,
starting and stopping traffic, starting and stopping a local loop-
back, and inserting errors (anomalies) or alarms (defects).
NOTE: Temperature stabilized lasers
When testing 10 Gigabit optical circuits, some lasers (par-
ticularly 1550 nm lasers) are temperature stabilized; there-
fore, they need to reach a certain temperature before you
can use them to transmit a signal. This is expected behav-
ior, and does not indicate that there is something wrong
with the laser or test instrument.
It typically takes up to one minute for the temperature to
stabilize. If you have turned the laser on, but no signal is
present on the receiving instrument or device, simply wait
for one minute.