In terms of the volume of games, NBC is behind other entities on both national & regional levels. To be fair to them, the focus of their sports programming is less dependent on college sports than other networks, so they can afford to carry a lower number of games.
NBC's primary sports outlet on cable will have 47 men's basketball games. 33 of those games will come from the Atlantic 10 with another ten from the CAA. The schedule also has the Barclays Center Classic event over Black Friday and Saturday after Thanksgiving.
Eleven of the games come from the CAA & Atlantic 10 conference tournaments. They will carry the CAA's semifinals and championship game plus the Atlantic 10's 2nd round and quarterfinal games.
One item currently missing from the NBCSN schedule is the Ivy League. The conference allowed its primary deal with the conference to lapse and for football the conference pieced deals together with FOX College Sports, NBCSN and the NBC Sports Regional Networks.
NBC Sports Regional Networks / Comcast SportsNet
NBC's RSNs carry a decent variety of college basketball across their RSNs depending on the location. In a fair number of cases, one of the RSNs is partnered with a school or conference, such as the CAA or some A-10 schools with CSNs on the east coast or the WCC with some of the schools in the Bay Area and Oregon. Those games will sometimes be sent to multiple regions as needed to fill time & programming space.
In terms of contractual obligations, the CAA has earmarked CSN as its primary partner and the A-10 has given the NBC RSNs preference when it comes to local & regional telecasts.
In addition to this, ACC & MVC games via FSN will appear on specific RSNs.