Describes a modulation profile for an Interval Usage Code for one or more upstream channels. Entries in this table are created by the operator. Initial default entries may be created at system initialization time. No individual objects have to be specified in order to create an entry in this table. Note that some objects do not have DEFVALs, but do have calculated defaults and need not be specified during row creation. There is no restriction on the changing of values in this table while their associated rows are active.