The example is using Data Marker Events. This is different than the Marker Events associated with Arb Waveform Mode. What the Data Marker Event feature does is, essentially, route out up to four distinct bits from the waveform data being fed into the main DAC on the 5422.
If you want the absolute best possible jitter performance on the sync pulse, then you'd be better off with one of our dedicated Function Generators, like the 5402 and 5406, which use a calibrated hardware comparator in order to create the sync pulse.
Marcos Kirsch Principal Software Engineer Core Modular Instruments Software National Instruments