; and (B) the useful life of the infrastructure for the provision of broadband service being financed. (2) Commencement Scheduled loan repayments of principal or interest on a secured loan under this section shall commence not later than 5 years after the date of substantial completion of the project. (3) Deferred payments (A) In general If, at any time after the date of substantial completion of the project, the project is unable to generate sufficient revenues to pay the scheduled loan repayments of principal and interest on the secured loan, the Assistant Secretary may, subject to subparagraph (C), allow the obligor to add unpaid principal and interest to the outstanding balance of the secured loan. (B) Interest Any payment deferred under subparagraph (A) shall— (i) continue to accrue interest in accordance with subsection (b)(4) until fully repaid