I never realized that NBC doesn't have like 30 announcers in Beijing right now, instead they get the same video feed you see at home.
The announcers are at 30 Rockefeller Plaza, nearly 7,000 miles from Beijing, sitting inside 14-foot-wide booths that are equipped with 24-inch HD monitors and headsets that pipe in the ambient sounds from the game sites in China. Every bit of 13 sports, and some of basketball, is called in this fashion on MSNBC, USA and CNBC.
They really do a good job of not making you notice they're not at the venue.