A stand-alone FlexOTO application is included in every FlexDCA installation. Use FlexOTO to:

• Test 400 GBd and 800 GBd modules on manufacturing lines. For example 400 GBd transceiver pluggables (4 x 100 Gb/s) and 800 GBd transceiver pluggables (8 x 100 Gb/s, 4 x 200 Gb/s).
• Maximize measurement throughput. FlexOTO does not perform the selected tests in a linear order. Instead, FlexOTO parses test algorithms to connected DUT fixtures, DCA-M instruments, and switches based on timing requirements and in-depth knowledge of measurement algorithms in the relevant standards.
• Maximize hardware utilization. The DCA-M oscilloscope is automatically shared between multiple DUT fixtures in the most efficient manner. And, when multiple DCA-M modules are used, FlexOTO concurrently runs measurement tasks on all DCA-Ms.
• Measure 53 GBd PAM4 OER, OOMA, and TDECQ tests.
• Minimize test setup time and provide flexible test setups. FlexOTO can account for WDM demultiplexers, attenuation, and fiber spools.

Starting FlexOTO

1. Start the FlexOTO application.
2. Apply power to your optical switch and to the DCA-M modules that you plan to use. Do not connect any USB/RS232 cables at this time. Only one optical switch can be used. The optical switch and DCA-M modules must be recognized by FlexOTO. If your optical switch is not recognized, you can write your own optical switch driver.
3. Allow time for the optical switch and DCA-Ms to boot up before proceeding to the next step.
4. Connect the USB/RS232 cables for the optical switch and DCA-Ms to the PC where FlexOTO is running.
5. FlexOTO automatically detects the optical switch and DCA-M modules via the LAN, USB, or RS-232 connections. In the unlikely event that FlexOTO does not detect a switch or DCA-M, you can open the FlexDCA application and manually establish the connections using FlexDCA's Extended Module Configuration dialog. Confirm that the optical switch and DCA-Ms have been automatically installed as extended modules. A Switch slot tile (and DCA-M tile) should be displayed in along FlexDCA's bottom tray.





6. Turn on each DUT Fixture that you will use in your setup.
7. Optional steps:
1. Use a patch cord to connect one DUT Fixture output directly to your DCA-M modules.
2. Open the FlexDCA application, and configure your DCA-M modules settings so that the DCA-M oscilloscope can trigger on and view the signal.
3. Remove the patch cord.
4. Return to FlexOTO.

Supported DCA-Ms and Optical Switches

External DCA-M Modules

At least one DCA-M acquisition group is required in the test setup. An acquisition group is a set of DCA-M modules that provide clock recovery and optical input channels. Here are two examples:

• A single N1092B with the clock recovery option CDR. (includes both clock recovery and an input channel).
• An N1078A clock recovery with an N1092D oscilloscope.

Recognized DCA-M Modules

DCA-M Module	Number of Optical Channels	Clock Recovery				Required Options	Connection Peripheral
		Data In	Data Out	Clock In	Clock Out
Oscilloscope Modules
N1092E	4			●		PLK, IRC, 30A/40A	USB1
N1092D	4			●		PLK, IRC, 30A/40A	USB1
N1092C	1			●		PLK, IRC, 30A/40A	USB1
N1092B	2			●	●2	PLK, IRC, CDR, 30A/40A	USB1
N1092A	1			●	●2	PLK, IRC, CDR, 30A/40A	USB1
Clock Recovery Modules
N1078A		●	●		●	S50 or SXT3	USB1
N1077B		●	●		●	SMM or SXT3	USB1
N1077A		●	●		●	SMS or SXT3	USB1

Optical Switches

The test setup must include a recognized optical switch.

Recognized Optical Switches

Model	Switch Ports	Supported Connection Peripheral
Keysight Switches
N7731A/C switch	2 channel 1 x 4	LAN, USB2
N7733C switch	1 x 16	LAN, USB2
N7734A switch	1 x 13	LAN, USB2
N7736C switch	4 chanel 2 x 2	LAN, USB2
DiCon GP750 switch	Depends on installed modules.	RS-232
DiCon GP600	Depends on installed modules.	RS-232
Polatis Series 6000 Ultra switch	12 x 12 12 x 12	LAN, serial, USB1
Switch (not listed above). The user must write a switch driver (*.py or *.exe). .