Can I run Ethernet traffic test head to head with a testset that is not a Viavi instrumnet?

Can I run Ethernet traffic test head to head with a testset that is not a Viavi instrumnet?

To run a quality of service test with a testset from a different manufacturer, it is necessary for one of the testsets to be placed into a logical loopback mode. This is done on the Viavi unit by enabling the LLB function on the device such as TB5800, HST, MSAM or Smartclass Ethernet. The test can then be initiated from the far end testset. If the far end testset also supports a logical loop then they can manually place their unit in loopback mode for the test to be initiated from the Viavi test device.