480P is a progressive scan rate that shows 60 full frames per second. Most 480P programming is derived from 30 frame sources.
480P is a scan rate used in NTSC broadcasting and is one of the many ATSC scan rates for DTV but is considered enhanced definition. 480P uses the component video system which has three wires or connections labeled as green, red and blue. One is the b/w signal and the other two represent the red and blue color difference signals. Component video is used as a form of analog compression to reduce storage space.
For more information go to, Scan rate.
480P is also heavily related to progressive scan DVD players and DVD movies. Progressive scan DVD players perform quite well with displays that offer a 480P native scan rate. While DVD movies are 480I sources they can be encoded with progressive flags during mastering telling the scaler in the DVD how to recreate the image in 480P. The system is not perfect but if your main concern is the movie only then this may be all you are looking for. The most consistent results come from using the native 480I signal from the DVD and using an external scaler.
For more information on scaling go to, Scalers.