An device and method for changing frame rates of video signals. Media selection logic may select one of the first PHY and the second PHY for communication with a target device designated by a target MAC address provided by the higher layer processes. A radiation beam including selected wavelength components is diffracted into an elongated image dispersed according to wavelength. At least one subscriber terminal receives the access grant message on the access grant channel and on the basis thereof assumes having reserved a dedicated channel. The invention also provides methods of delivering a bioactive agent to a patient in a controlled release manner, as well as methods of making a controlled release bioactive agent delivery device.