Could you explain synchronous vs. asynchronous errored-seconds calculation?
For telecom applications, international practice is to use asynchronous errored seconds (ES). Synchronous ES is primarily used in North America. For digital video, Tektronix has probably set precedence by its use of asynchronous ES (first in the 1730D, in 1991, and in all models of the WFM601 series). Since digital video systems run at very low error rates, the difference between sync and asynchronous is probably academic. Synchronous vs. asynchronous errored seconds describes how error events are binned. In asynchronous ES, a clock is used to divide time into 1-second bins. When an error event occurs, it is put in its proper chronological bin. The errored second calculation simply looks at which bins have something in them (1 or more error events). In synchronous ES, the bin is created when an error event occurs. The bin is made 1 sec long, so it will also collect any other error events that happen less than 1 sec after the initiating event. Note that the bin occurrence is synchronize