Pressure continues to build on the FCC to drop the “3 streams” based approach to its unlock the box rulemaking. The America Cable Association has this week come up with hard costs for different sized US cable firms to comply with the order, and filed them as an ex parte objection to the plan. Small rural MVPDs with around 15,500 customers were cited as having to spend $8.1 million to upgrade its systems to all IP in order to comply with the FCC proposed rules and take on other costs, and it offered calculations for other sizes of MVPD cable firms, all at about the same, highly unprofitable level. The upshot is that the ACA has called on the FCC…