SCOTTSDALE, AZ – IP set-top box unit shipments will surpass 21 million in 2011, up 14% year-over-year, says In-Stat.

Motorola remained the market share leader in 2010, with 21% of the market. North American IP STB unit shipments will increase 48% in 2012, and in 2013, Western Europe will account for 46% of worldwide IP STB revenues, the firm says.

In-Stat cited gains in subscribers by major telecommunications providers and replacement orders. Future demand will likely come from a migration to a server/client architecture, where a primary media gateway/server shares content with client boxes distributed throughout the home.