Datarate limitation for clients. Format is: rx-rate[/tx-rate] [rx-burst-rate[/tx-burst-rate] [rx-burst-threshold[/tx-burst-threshold] [rx-burst-time[/tx-burst-time] [priority] [rx-rate-min[/tx-rate-min]]]] from the point of view of the router  (so "rx" is client upload, and "tx" is client download). All rates should be numbers with optional k  (000s) or M  (000,000s).