However, some firewall and bandwidth throttling applications must interpret application data. US cell phone ISP's have also increasingly resorted to bandwidth throttling in their networks. Carbonite states they have eliminated bandwidth throttling for all of their customers. Examples are rate limiting, bandwidth throttling, and the assignment of IP addresses to groups. In 2009, the CRTC released a guideline for bandwidth throttling rules. AMD employs two different CPU throttling technologies. The FCC investigation concluded that Comcast's throttling policies were illegal. In 2009, Bluehost introduced a new feature called CPU throttling. This property can simplify the operating controls to a single valve throttling the turbine. Verizon has admitted to throttling content of its competitors including Netflix and YouTube. Positioners are typically used when a valve requires throttling action. This means that a mixture of gas and liquid leaves the throttling valve. A lean burn mode is a way to reduce throttling losses. Yaw and pitch are controlled by differential throttling. CECE was intended to lead to RL10 engines capable of deep throttling.