The reason you want to use at least some level of latency to keep 500-1k latent services like 3G or satellite as being considered as broadband. Let alone going over your daily monthly cap and being throttled back to sub dial up speeds.
Perhaps you measure your speed and latency to the ISP edge requiring the edge to work at no more than 80% capacity. Speed would be measured at sustained transfer rate over a 30 min period of time.
