- Provides interface for (3) standard loop-start CO trunks - Equipped with (1) 8-conductor interface jack - Must be installed on 082U 008U or 000U Cards - Max (1) daughter board per 082U 008U or 000U - Max of (4) can be installed in each Chassis (Main & Exp) - Max of (12) can be installed per system - *There is no Power Failure Transfer circuitry