National and local media both serve major roles in broadcasting sports in the United States. Depending on the league and event, telecasts are often shown live on network television (traditionally on weekends and during major events either national through a Television network, or in some cases, regionally syndicated by an operation such as Raycom Sports or a team), and nationally available cable channels (such as ESPN or Fox Sports 1). In some leagues (such as the NHL and the NBA), events are also primarily shown by regional sports networks groups (such as Fox Sports Networks), networks which air telecasts for teams of local interest, which are usually only carried within the relevant market. Additionally, cable channels also exist that are dedicated to specific types of sports, certain college sports conferences, or a specific league. Pay-per-view broadcasts are typically restricted to combat sports such as boxing, mixed martial arts or professional wrestling.