Why do digital stations sometimes have two channel numbers?
The FCC has assigned a digital or RF channel number to all digital stations. In addition, some local affiliates are using Program and System Information Protocol (PSIP) to remap to their analog channel numbers. PSIP is data that is transmitted along with a stations DTV signal that tells DTV receivers important information about the station and what is being broadcast (what channel to tune to for reception of the station, helps maintain current (analog) channel number branding, tells receiver whether multiple programs are being broadcast, etc.).
