This document defines an AV/C command set to control data rates on AV subunit plugs. The command set enables rate control of isochronous data flows between AV devices with the connections described in IEC-61883 [R2] and the AV/C Digital Interface Command Set General Specification [R3]. The rate control contains two models, the command-based rate control and the clock-based rate control. They can be per-formed with command functions, namely clock-source selection, base-rate configuration and flow-rate control.