-s:option(Value, "download", translate("Downlink"), "kb/s")
-s:option(Value, "upload", translate("Uplink"), "kb/s")
+
+dl = s:option(Value, "download", translate("Downlink"), "kbit/s")
+dl.datatype = "and(uinteger,min(1))"
+
+ul = s:option(Value, "upload", translate("Uplink"), "kbit/s")
+ul.datatype = "and(uinteger,min(1))"