Using The Action Buttons; Controlling Laser Transmission - Viavi T-BERD MTS 5800 Getting Started Manual

Chapter 4 Basic Testing
Step 4: Starting the test
• If you are running an Ethernet, OTN, Fibre Channel, or NextGen application
(launched from the SONET or SDH test menu options), and you are testing an
optical circuit, you must turn the laser ON, then actively Start Traffic (using the
corresponding action button).
• If you are running an Ethernet or Fibre Channel application, and you would like
your unit to transmit traffic automatically, you can enable the automatic traffic
generation feature. For details, refer to the Ethernet and Fibre Channel Testing
Manual that shipped with your instrument or upgrade.
NOTE: Temperature stabilized lasers
When testing 10 Gigabit, 40 Gigabit or 100 Gigabit optical circuits, some lasers
(particularly 1550 nm lasers) are temperature stabilized; therefore, they need to
reach a certain temperature before you can use them to transmit a signal. This is
expected behavior, 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.

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 loopback, and inserting errors, anomalies, alarms, or defects.
Table 12
Table 12 Action buttons
Button
Laser On/Off
Insert Error/Anomaly
Insert Alarm/Defect
Start Traffic/Stop Traffic
1. You can optionally configure optical standard Ethernet and Fibre Channel applications to automatically transmit
traffic after you turn the laser ON.

Controlling laser transmission

Some optical transceivers are capable of transmitting signals from different lanes. If you
are testing using a CSAM and your transceiver has this capability, after you turn the
laser on, you can "poke" the A013 register to turn lasers off for specific lanes within the
register.
Page 116
lists some common Action buttons.
Action
1
Turns the laser on or off when testing optical rates.
Inserts an error or anomaly into the transmitted traffic.
Inserts an alarm or defect into the transmitted traffic.
Starts or stops transmission of Ethernet, IP, Fibre Chan-
nel, OTN, TCP/UDP, or GFP traffic over the circuit.
T-BERD/MTS/SC Getting Started Guide
22046537, Rev. 016 March 2018