FYI, the BigTen does not own all of their Tier2 content as what we would consider Tier2. In Big12 terms, Tier1 is over the air broadcast, such as ABC and Tier2 is cable, such as ESPN and FSN. With the BigTen, they supply usually 3 games a week to ABC/ESPN. If ABC shows 2 BigTen games, like last week, they show a 3rd on ESPN. If ABC shows 1 BigTen game, like this week, they show 2 on ESPN/ESPN2. The BTN shows the remaining. Also, I don't believe ESPN usually gets 1st pick for that 3rd game.
In Big12 terms, if we kept our Tier2, as defined now, a Big12 network would show every game except 16-18 ABC games a year. What the BigTen has done is split their Tier2 in half and supply part of that to ABC/ESPN as part of that larger contract. What the BigTen considers Tier 1 is much larger than what the Big12 considers Tier1. To say that the BigTen owns all of their Tier2 content is very misleading considering that in the context in which the term "Tier2" is used between the two conferences is very different.
Also, the SEC defines their Tier 2 the same as we do, that's why they make so much money off their Tier2. They consider the contract with ESPN to show 2-3 games a week on ESPN/ESPN2 as Tier 2. The BigTen considers their contract to show 1-2 games a week on ESPN/ESPN2 as part of their larger Tier1 contract with ABC/ESPN.